Oh no! I have delayed this for more than two months! Freaking more than two damn months! Holy sh—
Sorry for the cursing, guys, but I'm just thinking that it was so unfair to read lots of book and not caring about writing. So to make up for it, there's a surprise! I'm seriously sorry, everyone.
Beware of cursing words.
Kiritsu! Rei! Lock on!
—————(;-;)——————
Third person POV
  "Ichi! Ni! San! Shi! (1,2,3,4!)"  In the foreground of Kunugigaoka Junior High School Old Campus, students of class 3-E were having a P.E lesson. "Go! Roku! Shichi! Hachi!(5!6!7!8!)" Koro-sensei, who was holding a yellow flower and wearing his sports clothes, looked peacefully at the scene. "The sounds of exercise echoing across the field on a sunny afternoon... how peaceful." He closed his beady eyes for a few seconds. "If the students didn't have prey in their sights, that is." In front of him, class 3-E is wielding the rubber knives in synchronization.
  "Wield your knives properly in all eight directions, now." Karasuma commanded as he, too, was watching the students wielding the knives. "From now on, I'll be in charge of P.E."
  "That makes me a little lonely." Koro-sensei admitted. "Did I tell you to make yourself scarce during this period?" Karasuma stated, not looking at him, as he pointed his thumb backwards. "Go play in the sandbox."
  Koro-sensei has comical tears streaming down his face as he went playing in the sandbox. He whined like a child who had just got his candy taken away. "You're so mean, Karasuma-san! Why? My students happen to like my gym classes!"
Sosuke immediately accused him. "Liar. Koro-sensei's physical abilities are just too different." Sugino backed him up. "Remember that time?"
—————Flashback—————
"Now let's try jumping side to side. I'll show you how it's done." Koro-sensei, in his PE suit, was standing between the white stripes that had been drawn on the ground. He jumped side to side, yes, but in his Mach 20 speed. So he looked like a yellow patch that blew smoke everywhere.
The students had their mouths agape. "As if!" They synchronized as they reacted quite quickly and suddenly with eyes all popped out.
"Once you're used to it, toss some cat's cradle into the mix." The still-jumping teacher said as he add the cradling rope (?idk) and started cat's cradling, not breaking his jump.
"Damn he's good!" The students freaked out once more.
————Flashback ends————
"He's just too far out." Rio crossed her arms sympathetically. "I'd like a human teacher for gym, thanks." Sugino said somewhat too cold and blunt, which made Koro-sensei flinch and continue his work while being depressed not-so-silently, "boo hoo hoo..." he whined childishly.
Karasuma either didn't see it, or chose to ignore it. "Okay, let's get to work." Maehara questioned him. "But Karasuma-sensei, is there any point to all this training? And should we be doing it right in front of our target?"
"It's the same in assassination as in studying." The strict teacher put his hands on his hips and looked directly at the students in the eye. "Drill the basics and they'll serve you well."
They're the same? Nagisa questioned in his mind as he stared at the PE teacher.
"Isogai-kun, Maehara-kun, step forward." Karasuma commanded attention the first line of students. They obliged and he continued. "Try attacking me with those knives." Those words made them flinch in surprise. "Are you sure?" Isogai asked him in concern. "We're a team?" Maehara questioned him.
"Those knives won't hurt us humans. If they give me so much as a scratch, you can go home for the day." He said as he loosen his tie.
  "Um, well...er, okay then." Isogai looked at Maehara in uncertainty, and they got to their stances.
  Isogai stroke first, running towards Karasuma and tried to hit his right body with the knife. Karasuma casually dodged sideways, making the teen lost his balance and nearly fell. "Come on." He taunted Maehara with his monotone voice. It clearly worked as Maehara, with a face of determination, took his move. He attacked Karasuma, only to have his knife hand being caught with one hand of the teacher, and he was being pushed downwards by the other's remaining hand. The duo continued to attack the teacher quite randomly, hoping to get the knife to touch the teacher, but no avail as he kept dodging and defending by yanking them away.
  "As you can see, with a little knowledge, even I can handle the knives of two amateurs." He pushed them out as a sign of stopping and said. The two teens tch-ed, not like being called amateurs.
Wow... Nagisa thought with admiration.
  Maehara and Isogai continued to attack, this time together. But the teacher took hold of their hands and with just one hand each, flipped them to the ground. "If you can't hit me," he continued as he stood up straight again, "your chance at hitting him at Mach 20 is slim to none." He turned his head to the sandbox. "See? While we were sparring,—"
  The scene changed to Koro-sensei who was in traditional clothes and sipping matcha. Next to him was a miniature sand version (not so mini) of a Japanese Castle that stood proudly. "—he build Osaka Castle in the sandbox, changed clothes, and is brewing up some tea!" "How infuriating!"

  "Once the whole class is capable of hitting me, your chance of success will increase by leaps and bounds." He tightened his tie back to its place. "During our class, I'll be teaching you shooting, stabbing,— all the assassination basics."
  "Whoa." Sugino stared at their PE teacher in awe.
"That's all for today." The said teacher dismissed the class. They bowed. "Thank you!"
  A dark trouser leg could be seen from the classroom campus, watching the whole class down the patch from afar.
  "Karasuma-sensei can be scary, but he sure is cool!" The girls' conversation caught their homeroom teacher's attention, whose face quickly dreaded when he heard the next sentences. "Right! Do you think he'll pat us on the head if we managed to hit him?" " I wonder." Hayami Rinka, who hadn't said anything since the beginning, spoke up.
Koro-sensei bit his tentacle as he said to Karasuma who was putting his blazer on and staring to leave. "You're trying to steal my popularity from my students, aren't you?!" It sounded like a statement. "Don't be ridiculous," Karasuma replied, not looking back, "'if the school so desires, it may assign an additional teacher to the E class.' It says so right in your employment contract." He finished his sentence by throwing a knife at the octopoid teacher who caught it with a handkerchief. "My duty is to provide onsite assassin monitoring, all in the name of killing you."
Said target took off his traditional Japanese hat on his head. "Please, call me by the name the students gave me," he changed back to his normal clothes. "Call me Koro-sensei." He got back his cool (?) attire.
"A test in sixth period, eh?" Sugino groaned. Nagisa smiled in sympathy. "Wish we could've gone home after gym."
But then the blunette stopped in his track when he looked up to the higher ground of the classroom.
"Hey, Nagisa-kun." The red-headed figure there, holding a box of strawberry milk, greeted him. "It's been a while."
"Karma-kun, you're back!"
The boy, known as Karma, gave him a close-eye smile.
—————————————————
"Heh..." the golden-eyed boy's eyes sparkled with interest. "So that's the infamous Koro-sensei?" He walked down pass Nagisa and Sugino to their teacher who, as well, was heading towards class. "Whoa, he really does look like an octopus."
"Akabane Karma-kun, is it? I heard your suspension was up today." As the teen came to Koro-sensei face to face, the yellow teacher raised up a tentacle in acknowledgement. "But you shouldn't ever tardy on the first day of school." His face turned purple.
  Karma chuckled a bit forcefully. "It's hard to get back to the swing of things." He answered with a smile on his face. "Feel free to call me by my first name. Nice to meet you, Teach!" He extended his free hand to the teacher.
  "Likewise, let's make this a fun year." The octopoid superbeing raised one tentacle and grasp Karma's hand. They were both smiling and it looked like a happy scene.
Bam! The tentacle that was held by the red head exploded. (Yup, definitely happy)
  "Huh?!" The yellow teacher's face flashed surprise. Karma threw the strawberry milk box and skillfully take a knife out from his sleeve underneath, then swiped it at the teacher who quickly dodged by jumping backwards.
  "Wow. You really are fast..." Karma stated playfully with venomous voice as he stood up from his stance, "and those knives really do work." He looked at his his right hand, the hand which was holding Koro-sensei's tentacle earlier, and revealed that his hand had pieces of the green rubber knife. "I sliced one up really fine and stuck the pieces on. But, sensei, to be caught by such a simple trick," he showed his hand to the teacher, and looked down at him, "and to jump back all that way... What are you, a scaredy-cat?" He mocked Koro-sensei who was a few meters away from him, and started walking to the yellow guy.
He's the— he's the first one, Nagisa gawked at the scene laid out before his own eyes, to hurt Koro-sensei!
  Karma was still walking to the teacher as the tentacle regenerated. "I heard they call you Koro-sensei because you are unkillable." His feet reached their destination. He bent his body to look at the teacher whose face seemed scared but not enough to change color. "But what's this? Are you a pushover after all?"
  Koro-sensei turned red angrily and veins popped from his head, reacting to Karma's over-mocking.
  "Nagisa, what kind of person is Karma-kun?" Kaede asked Nagisa in the background. "Well, we were in the same class our first and second year," Nagisa replied, not looking away from the red head and the yellow teacher. "But then his continued violent behavior earned him an expulsion, and those students end up here in E class, too. But... here, he might just be a star student." "What do you mean?" "When it comes to deathly weapons and foul play, Karma got us all beat." Said boy was twirling the knife as if it was just a normal toy.
  Don't run away, Koro-sensei... I'll show you what it means to be killed.
  As he walked pass Nagisa, he said something to the blunette. "By the way Nagisa, she's here."
Really? Nagisa shot the other a questioning gaze. Go to class and see, was his silent answer.
Now what had she done to come to this class as well?
  As Nagisa walked to the classroom door and opened it, a voice spoke up. "Ah, Nagisa, Long time no see." It belonged to a teenager with (e/c) eyes that glinted a bit of interest. "Y/N! Nice to see you again!" He smiled and welcome you.
  "L/N Y/N (Japanese name order, mina-san), you are the other new student here, correct?" Koro-sensei, who had come in after that, asked. "Yes. I take it you're our homeroom teacher?" You confirmed and raised an eyebrow. "Correct." His face turned purple. "You're late, what's your excuse?" You answered him truthfully with monotone voice. "I got here on time, but seeing that the class is having assassination practice lesson, I decided to just stay." You stopped for a while, then added, "I don't kill."
  "What?!" The class, except for Karma and Nagisa, gasped.
  "He's just blown up the moon!"
   "If you don't then the Earth might be destroyed!"
  "Don't you see the consequences?!"
  They started reasoning, which made you irritated. You glared. "I don't care. I'm not going to kill him, and that's final." They stopped immediately, seeing your famous icy-cold glare. (Yes, you do have one, in this story, cuz I thought its cool and Y/N-chan is a tsundere after all :D)
Right. She's the Ice Queen in school, we forgot. The class thought simultaneously. But why? The Earth is going to be destroyed! We need to use as much help as possible while keeping it a secret!
  You eyed them one by one, then sighed. Amateurs.
————————————————
The class was currently having a quiz. But Koro-sensei was having none of it, he punched his tentacle to the wall while letting his head rest on it, and silently releasing his childish anger.
"What's Koro-sensei been doing all this time?" Koki asked, since the teacher's body blocked his view of what he was doing. "Uh, like, punching the wall?" Yada sweat dropped. Koki, had his question answered, turned back to the quiz. "Yeah. Karma's smack-talking must've pissed him off." Maehara stood up and leaned forward to get a better view of the tentacle which was hitting the wall continuously. "But his tentacles are too soft to damage the wall."
Koro-sensei's Weak Point #4: His punches are too soft.
Hinata had had enough of it. "Uh— enough! Quit with the squish-squish! We're trying to take a quiz here!" Her sudden outburst made everyone near her surprised and the teacher panic. "P-pardon me!" He apologized, finally turned his head from the position he was in.
You were doing the quiz while listening to their whole conversation, so from your position beside the prankster, you asked him. "Karma, what is it this time?" But because of your cold and emotionless tone, it sounded like a remark. Karma chuckled, "Just doing my usual~" which made you roll your eyes quite playfully and turn back to the quiz. (Remember, you and Karma are best friends, like you and Nagisa)
"Hey Karma, you sure about this? That monster is pissed." Terasaka, who sat on Karma's right (you're on his left) side, faced the red head with his face clearly interested, while his gang in front of him turned back to see how this would end. Taisei smirked, "This is all on you, man!" Takuya continued, "sure you're not better off holin' up at home?"
Karma have his poker face on as he replied. "You would be pissed too, Terasaka, if someone had started to kill you." He continued mockingly. "Not like when a certain someone screwed up and wet himself." His eyes shone mischief.
"I did not wet myself! You cruisin' for a bruisin', pal?!" Terasaka slammed his fist on his desk. You just admitted it yourself, he didn't say who, you thought while watching the conversation, already done with your quiz. You started to space out, thinking about how you got free. I was smart enough to buy an apartment when I got enough to money from my salary. That man was a bastard, sure, but at least his rewards were high enough to make a living.
—————Flashback—————
-After you were free, unknown location-
You took your safe out and carefully unlocked it. You were lucky enough to have this safe, given by one of the neighbors who mistook you for some random businesswoman, not that they needed it anyway, you thought.
Inside the safe were organized piles of money that you've earned ever since you started your subconscious killing, which was when you were four. At that time, "That man", as you refused to call him "dad" when he wasn't around, started to request for killing missions everyday, and the rewards were high. Of course, even if you kill the victim subconsciously, it was still your work, so you still have your own rewards, usually about half or sometimes two-third of the price the person paid. In times when you still haven't figured out about the cruel plans just yet, the man answered to your question about the large amount of money you received as "pocket money and reward for being a good daughter." You dared not to spend the money, so you kept it in a secret hole under your bed. After being moved to a tougher metallic one, this happened and you decided to hide the safe somewhere you could pass by after receiving the rewards.
  After years of saving up, the money could easily be used to buy a small apartment, and even manage the school fees and make a living if you try to organize it. So you bought an apartment and then started an independent and free life, deciding that your life right then would depend on the heap of money left, scholarships from school and rewards from competitions, as long as it had quite much amount of money for the first place.
  From there you tried to attend many academic competitions near your area, and always got the first place thanks to your high IQ and calculating brain. Half of the money was spent for daily living while the other half was for saving up to manage more school fees and monthly bills you must pay.
—————Flashback ends—————
"You there! No loud noises during the test!" The yellow teacher pointed at Karma's direction and angrily commanded, which made you snap back to the present. "Why, that could even be considered cheating!"
  "Tell that to your tentacles!" The students murmured angrily.
  "Sorry, Koro-sensei. I've already finished, so I'll just sit here quietly and eat my gelato" Karma raised the pink gelato in his hand. "Not during class, you won't!" The yellow guy was still in his previous position as he scolded Karma. But then he took a better look at the gelato and realized something. "Hm?" He started to freak out. "Th-That's the gelato I brought back from Italy yesterday!" The class let bangs cover their eyes and said simultaneously, except for Karma who was licking the ice cream with pleasure. "It's yours?"
  Karma stopped eating and faked a surprised expression. "Oh, sorry! It was just chilling in the staff room." He finished the sentence with a mischievous tone. "'Sorry' won't cut it!" Koro-sensei retorted back. "I took pains to fly through the coldest stratosphere to keep that from melting, too!"
  "Heh....So whaddya gonna do about that?" The red head raised his brows in mild interest and licked "his" gelato once more. "Hit me?"
  The scene changed to the front part of the classroom, where the octopoid teacher was having difficulties in suppressing his anger, the prove was his red face. "I will not! I'll just have what's left!" He put his tentacles on his hips, then walked towards the back of the class. "Come now, hand it o— eh?!" He looked down to see his tentacles being blown up or cut by the BBs on the ground. "Anti-me BBs!" He recognized the small pink balls and sweat was seen on his face. Click! Click! Click! Gunshots were heard as the teacher dodged sideways. "Gotcha again!" The culprit mocked his victim with despise, while the other raised his blown up tentacle and looked at it clearly in a weary way.
"I'll just keep using the same old tricks." Karma stated as he walked up to the bewildered teacher with gun pointed at his victim, ignoring all the stares from the class. "Even if it interferes with class." His gun then came directly at the moon cravat on the teacher's neck. "If you don't like it, kill me or anyone else here." His gaze dug deep into the other's face, sparkling with violence. "But the second you do..." the gelato in his hand was dumped in the other's red fabric of clothing, "no one'll see you as a teacher anymore." He dropped the gelato on Koro-sensei's tentacle, the other not bothering to pick it up. "You'll just be a murderous monster. You, the teacher, will be killed by me." His eyes shown violence and menace, dancing like crazy blazing golden flames.

He threw his quiz paper to the teacher's side, walking past him. The latter only reach out a tentacle to catch the falling paper, as a sign of acknowledgment. "Here's my quiz. Probably got 'em all right." He opened the classroom door and not forgetting to say a goodbye. "See ya, teach. Let's play some more tomorrow."
   You replayed the scene in your head. Karma is extremely quick-witted, like then. He saw there was a line that this octopoid superbeing couldn't cross, without losing his "teacherness", and the tactics he uses to make him toe that line. You twirled your pen in deep thoughts. He has the smarts to see the heart of the matter, and the skill to manipulate just about anyone, but he uses it to clash with people. A sigh. His way of doing things, I guess.
After all, I am pretty much the same.
—————————————————
The sky was then the central scene.
"Honestly," Koro-sensei thought out loud while flying with his Mach speed, "now he's forced me to go buy more gelatos." Gripped tightly in his tentacle were the quiz papers of the class, with the name Akabane Karma on top, who, indeed, got it all correct. "He's smart and tough, but as he says, if I'm going to stay a teacher, I'm not allowed to kill or hurt him." He flew upwards. "And let's not forget about the other new student. She is quite a mysterious and icy one, indeed, yet she hadn't make any moves. So... how to deal with them, then?"
——————just then——————
"Y/N!" Nagisa called out as he, Kaede, and quite a few others reached your desk. "Can I ask you a question?" He asked cheerfully yet his face looked serious.
You raised an eyebrow. "Spit it out."
"How did you get here? You hadn't violated any rules, and your scores are great too!" Nagisa asked what every other wanted to say. You looked surprised for a split second, and keep your head on your hand while letting the elbow rest on the desk. "How indeed..."
—————Flashback—————
"Hey L/N-san, the principal wants you in his office." A classmate told you. "I don't know what happened, but wish you luck."
You looked at her. "I don't need luck."
"Yeah yeah, just go." The latter rolled her eyes dismissively.
What? You thought while walking to the principal office. I haven't done anything so far, just what the heck? Everything is still normal! Not for long, you feet reached the closed door. You knocked politely. "Sir, this is L/N Y/N. May I come in?"
"You may." A deep voice sounded from the other side of the door, which sent you unknown shivers. You opened the door, shaking the feeling off, then closed it behind your back as you came in and stood in the middle of the room, holding your hands behind your back.
The principle did not face you, he was sitting in a swivel chair and was viewing the school from the glass wall of the office. The room was dark, but neither of you felt like turning the lights on. Not now, not ever.
"Let's get straight into business." He started as shivers consumed you again. "You are going to move to class E." You sweat dropped but didn't dare say something out loud. You voice didn't shiver, but it was meek and tiny. "Sir, may I ask why?"
"I see you as a potential of intelligence, and I think you would be the best choice to move to class E and teach them some manners, as not just a student, but a guardian. After all, we do hope that class will improve now don't we?" "Yes sir." You answered cautiously. "Good. I see you understood the matter." The principle stated with his mysterious yet dangerous voice. "You will start your learning in class E in tomorrow. Before that, read those papers on my desk." You started walking warily to the wooden desk and picked up the papers, reading them in the dim lights provided by the outside world, which is almost covered and only let little rays of light ran past.
After a while, you've done reading and stepped back to your original position. "You understood what has to come?" "Yes sir." Your voice got colder this time. "Then you have two choices. One, to be an assassin like they are training to be, or two, just be an ordinal student guardian and do not take part in killing." You can make out two fingers silhouetted in the lights. "I will choose the latter, sir." "I see. You may also change your opinion later. You are now dismissed." "Thank you sir." With that, you left the office, a relieved sigh escaped your lips. That sure was frightening.
—————Flashback ends—————
"So basically you were our guardian?" Sugino asked after hearing your story. You nodded slightly.
  "I still can't understand why you didn't choose to take part with us though." Maehara complained, "I mean, it's worth ten billion yen! And the whole world is going to be destroyed by him if we don't act fast!"
  You replied casually,"I have my own reasons." "Why? Are you scared of dirtying your hands? It's a world-matter, not some random assassin plays!" The orange-haired teen continued quite angrily. "I know that." Besides, my hands are already drenched in blood. That was only your thought, of course. "Come to think of it, you're not?"
  Maehara was taken aback by his own words. He seemed to think for a while. "Well... if I say I'm not then it would be a lie. But it doesn't matter, come what may, we'll save the world. Even if it makes us look like cold-blooded killers."
  "Well said." You complimented him like a teacher saying that to a student who just got his answer right.
  "The famed bad boy and the well known Ice Queen... you sure made lots of weird friends, Nagisa." Sugino listed and sweat dropped. Nagisa could only smile helplessly.
——Kunugigaoka Station, after school——
"See ya, Nagisa, L/N-san!" Sugino waved goodbye as he parted ways with you and Nagisa. "Yeah, see ya tomorrow!" Nagisa replied cheerily, while you just raised two fingers in a V sign, as your typical goodbye. (That's what I usually do for goodbyes and hellos, sorry if you don't do that!)
Tanaka Nobuke and Takada Chosuke, who happened to walk by at the time, didn't forget to mock the blue-haired boy. "Hey, look, it's Nagisa!" Nobuke said with mocking tone. "Right at home down in the E class!" He gossiped intentionally loud enough for Nagisa to hear. "Barf. He'll never make it to our class like that!" Chosuke commented bluntly. "Plus, Akabane's back now that his suspension is over!" "Well, don't forget the cold-looking bitch, she's there too!" "Tch. That bitch. She's always think so high of herself it hurts!" They both laughed as your eyes narrowed into slits. "Well that's the pits! I'd seriously rather die than to wind up there!" Chosuke had just officially added fuel to the fire. A vein popped and you looked berserk, bangs shadowed your face, only to add more frighten to your already uncontrolled emotions.
Crack! The sound of a glass bottle being smashed echoed behind the two, making them flinch and went sideways.
"Really? You'd rather die?" Karma raised the smashed half of the bottle.
"How about... now?" You questioned them as you appeared right before their own nose while your (e/c) eyes gleamed dangerously behind your bangs.
"A-Akabane and L/N!" They half-squeaked and scurried away like mice.
"Haha!" Karma threw the bottle half away, and you got back to your cold poker face. "Like I'd actually do it! With such a great toy to play with, who would want another suspension? By the way, thanks for saying it, Y/N-chan!" You nodded. "Welcome."
The newcomer walked up to where Nagisa and you had stood earlier. The blunette only called his name with slight concern. You stood at the side of the conversation, feeling a bit left out. Well never mind, let them be all love birds. You rolled your eyes and managed a small smile.
  "So listen, Nagisa, there's something I wanted to ask." The boys were still engaged in a conversation, not paying attention to the only girl who just shrugged. Well, you've never liked attention, anyway. "I understand you know a few things about Koro-sensei." Karma walked through the security (the what now?) by pressing his card on the identification part, Nagisa did the same. Here we go again... you sighed as your wave got unnoticed, but continue walking home nevertheless. You hate the train, because obviously you hate crowds, and trains are the exact place where you can find them. Yeah, your house is not that near from here, so what? You thought you can tolerate an hour walk or so towards home sweet home. So you turned away, the boys' voices facing to the background.
  Birds were chirping everywhere, the sound of leaves rustling and getting crushed beneath your feet, as you walked into a park and decided to take a rest. You take in deep breaths of air, feeling refreshed.
  "Hmmm," you hummed thoughtfully, unconsciously forming a small quirk on the lips, "that teacher seems interesting... wonder why he wants to be killed, though. And I need to meet my savior too. It isn't so hard to find a person with abnormal skills, is it?" Seeing some more people started to pour into the park, you decided that it was time to set home once more. I might need to buy a motorcycle at this rate.
———Just then, Kikugaoka Station———
  "Does he get mad when he gets called an octopus?" Karma looked at Nagisa and the blunette shrugged. "An octopus? On the contrary, I think. His self-portrait is an octopus, and he picks the octopus character in games. And when he was digging the sandbox..." a memory played in his head. "Octopus trap." Koro-sensei, who had finished digging, had put his whole body down the hole and pushed the sand back squarely, only left his face. The students sweat dropped continuously.
  "...So if he's making jokes like that, I'd say the octopus thing is kind of his trademark." Nagisa finished.
  "Hmm. That gives me a little idea." The red head stated, still smiling. The shorter one tilted his head to the side. " What are you up to now, Karma-kun?"
  "I'm happy, is all."  Said boy closed his eyes and turned back. "I was wondering what I'd do if he's just some monster, but turns out he's an actual teacher."
A train went fast behind him, making shadows on his face and blowing his clothes. His eyes shone with pure menace, lighting the golden orbs up beautifully, yet dangerously. His mouth spread in a wide sly smile.

"And I get to kill an actual teacher... I mean, since the last one up and died on me." His tone amused, yet somewhat unnerving. Nagisa could only stare wide-eyed at his friend, who was still in his own little bloodlust.
——Kunugigaoka Junior High, Old Campus - Next Day——
"I didn't see this coming. My gelato money— gone!" The yellow superbeing was holding his purse, inside of which was only some coins left. "And no hope of getting more before pay day! I'll just have to make my own." He cried comically for a moment, then open the sliding door, crouching a bit to walk though it, and got into the classroom. He looked at his class and greeted. "Good morning, students!" The only thing that greeted him back was the expression of his students. "What's wrong, cla—"
Following the students' gazes, he turned to the teacher desk, to realize there was one thing he had missed, laying there.
A red octopus was carelessly pinned in the middle of the desk, its lifeless tentacles being put away from the edge. Its head was stabbed by the large pin, eyes popped out. The poor thing was being put there, its dull eyes looked wild, and the red body spread all over the teacher's desk.
"Whoops, my bad!" The only student whose face wasn't so bad, voiced out. "I mistook it for you and killed it instead." Karma smiled his signature smile. "Bring it here—I'll dispose of it."
"Alright." Koro-sensei used one tentacle and wrapped it around the octopus, then picked it up and started walking towards the red head.
Bring it on, Koro-sensei. A knife was in his hand, well-hidden behind his back, and he was playing with it silently and patiently waiting for his chance. I don't need to kill your body right now. I'll start by slowly killing your soul.
The teacher suddenly stopped midway, his yellow tentacles turned into drills with a whirlwind-mechanical-like sound, all pointing at the golden-eyed boy. The latter could only let out a surprised sound when his body blurred by intense speed, leaving yet again some smoke and the class' yelp.
He reappeared with a missile pointing downward on one tentacle. "Allow me to show you, Karma, the might of these drill tentacles." His drill tentacles pointed upwards while some of his other tentacles were bags of spices like tempura bits, flour, sauce and bonito flakes. "And the firepower of this missile I filched from the Self-Defense Force!" The missile let out some fire as to illuminate his words. Karma could only stare.
The yellow octopus started his multi-tasking: two tentacles for mixing and beating eggs, one add some spring onion in while another got a knife to cut it, one more pour some flour in while the other one got ready for the make-shift octopus roasting. "I will not let any of my assassins get away scot-free." He said. The red octopus was quickly cut to even pieces, dipped into the mixture of egg and spices, then roasted above missilery heat. Then the dish was done after another one of his tentacle reached for a dish out of nowhere to put the delicious takoyakis on, one sizzled some mayonnaise, and the last one sprinkled some grilled spring onions on top fashionably. After he was done, the dish was already coated in some sauces. The even pieces of takoyakis were steaming with heat. They were coated with some brown sauce, shining deliciously in the natural light from outside the classroom. The mayonnaise was sizzled perfectly to not ruin the sauce by over-pouring, which was a surprise, since an owner of the speed Mach 20 could be this careful and perfectionist. (Sorry, somehow my phone failed to upload a pic here, just try to imagine it or watch the series/read the manga cuz I suck at describing)
  And as fast as twenty times the speed of sound, one of the takoyakis was already sitting in Karma's mouth. He spitted it out and covered his mouth as if he had tasted something disgusting.
"I could tell by your pallor that you haven't eaten breakfast." The teacher stated. "So I whipped up a batch of takoyaki at Mach speed." He stabbed one with a drill tentacle. "With these, you'll be well on your way to being nice and healthy. Open wide!" His drill tentacle with the takoyaki on made its way towards Karma's mouth, which was covered by his hand.
  "Karma-kun." Koro-sensei called gently. "My job is to tend things. To take care of them. Things like assassins' rusty blades." He gave his message. "So keep trying your hardest to kill me today. Every time you do, I'll take care of you." Karma quirked his lips upward, annoyed.
  "By the end of the day, your body and mind will be polished to sparkling." The teacher waved his tentacles widely and declared.
——————1st period: Math——————
  "As you can see, the number is left over, no matter what you do." Koro-sensei wrote the problem on the blackboard, his back facing the class. "If this indivisibility is getting you down, then have I got a method for you!"
The Akabane teen was not paying attention, as he had already figured out yet another way to possibly kill the teacher. He smirked and raised the gun he had hidden in his blazer, aiming lazily at the teacher with his head cocked to the side.
  "Everyone try solving it together." The yellow guy seemed to hadn't figured out that he had been targeted yet again by the same student he had dealt with earlier, as he was still back-facing the class.
  With a smile, the red head drew the gun. In a flash, there was a tentacle which dashed seemingly to block the bullet, and Koro-sensei's head didn't even turned as he caught something. "Oh and Karma-kun," his face turned to the one mentioned, "it takes too long for the fired BB to hit, I'm afraid." He raised the gun in his tentacle. Karma, upon realizing that his gun had just been stolen by the Mach 20 teacher, had discovered another surprise.
  "And since I have plenty of time," the yellow guy continued, raising nail art tools in his tentacles, "I gave you a little nail art." The red-haired teen lifted his hand, whose nails were colored and painted with octopi and tentacle patterns while his eyes twitched.
——————4th period: Home Ec——————
  Koro-sensei walked around the class in a cook suit (idk anyone had a better choice of word?) and watched the students cook some soup. "This one seems kinda salty..." (Y/N) said as you took the small spoon to your mouth and tasted the soup. "Some greens might do the trick." You decided and tossed in some green vegetables.
"(L/N)-san, you forgot your apron." Koro-sensei's voice rang and in a flash you were in a black apron with some zigzag scarlet stripes adorning the below part. A small red lightning bolt was embedded on the left side of your chest and black cook hat completed the attire as your eyes widened in a mild second. Then something flashed through your mind.
"How do you know I like red, black and lightning?" You asked and glared, the teacher seemed suspicious.
"Ah I-I did some research on you..." said teacher raised his tentacles up in defense. "Is that so?" You quirked an eyebrow, but internally you were quite scared. What if he figured it out already?
"Yes!" The octopoid superbeing seemed panicked.
"..."
"I haven't done anything wrong!" He whined, he just wanted the best for his student! Why did it came out like this?
"..."
"Your ellipses scared me!"
"Okay then." Your glare lightened and you turned back to cook. The teacher sighed in relief as he put his tentacles down.
"Yup, this sure works." You said as you tasted the soup again (based on my own experience!), like nothing had happened. "Let's go to the next stage."
Through your bangs as you were lowering yourself to smell the soup, you saw a small incident in class caused by Karma. He's always into tricks and pranks.
The soup of Fuwa's duo was thrown into the air by the red head, with the aim of distracting the yellow superbeing and swipe-stabbing him with the rubber knife. Clearly it didn't work, because the teacher was quick to suck said soup up in midair with a dropper, plus adding some sugar in it, since the soup had quite a sharp tang, as Fuwa confessed to him and he had tasted himself earlier. He even managed to dress Karma in a girly pink apron! (Idk what's wrong with my phone anymore, I can't upload the most hilarious pic!)

In the end, Fuwa tasted the soup and thanked the teacher for making it milder, while Karma received a mocking "Kawaii" from Terasaka, and snatched his hot pink cook hat of with a slight blush on his face.
Well, it's no use. You thought. From what I observed, he made lots of mistakes and screwed things up once in a while, but he can't be killed with those tricks.
——————5th period: Japanese——————
"'It was an ideal place for the red frog'" Koro-sensei read a poem for the class. "'Why didn't it try to cross there?'"
Koro-sensei has tons of weak points, Nagisa thought while half of him paid attention to the poem, and his reaction speed drops to human levels when he's flustered.
  "'Even as I was thinking this,'" the yellow teacher continued to pace around the room. No matter how good Karma is at surprise attack...
  As if on cue, when Koro-sensei went past him, he automatically took out a knife from his pocket, face as bored as ever, only to be given a tentacle finger right on his forehead.
  "'The red frog, having failed again, was making his way back.'" One other tentacle was on his knife hand too as the teacher stopped in his track and looked at Karma as if he was the red frog in the story. "'I was starting to get bored with it...'" He continued, while putting some sprays and taking care of Karma's hair, the teenager not gotten out of his surprised state just yet as he sat still, his eyes widened and staring at the teacher.
  "'Picking up some stones from the road,'" the yellow teacher's voice didn't waver just the slightest bit. With Koro-sensei on especially high alert, this assassination was like an impossibly tough video game. "'...and began throwing it at the sandbox.'" The teacher was still reading when the bell rang its melodious sounds, signaling for the end of period. "'I was not trying to hit the red frog...'"
————After school, Cliff Edge————
  Karma was biting his nail as he tried to control his anger and frustration. He was sitting dangerously on a branch grew out from the cliff edge with a leg hanging in midair.
  "Karma-kun..." Nagisa called softly. He was standing in the safe area of the cliff with Y/N, having followed his red haired friend there.
  "Y'know, it's no use if you keep attacking him." Y/N spoke up, you have been quiet for a long time. "You'll just make his alert go higher and higher until you can't pass his defense walls anymore. Don't sweat it." You advised him.
"Don't sweat it," Nagisa agreed, "we can do it together. Once Koro-sensei had his eyes on you, you can't kill him by yourself, no matter the method."
"He's not like the other teachers." You finished for him. Well, that has just given Karma the plan that he thought would never come to him after biting his nails for such a long time that he thought it would be smashed and cracked by then.
"Teachers, eh...?"
"Akabane, you're right!" Their old B-class homeroom teacher's voice rang in his mind.
"Though you are combative, with the share of behavioral issues—"
The two of them were walking inside the empty hall. His teacher and him, side by side. It seemed like a good atmosphere, when his teacher smiled and he kept his signature uncaring face displayed.
"As long as you're on the right, I'll be on your side!" The teacher had put his hand on his shoulder, and said it just like that. His teacher even pointed his thumb to himself to illustrate his words.
Karma remembered his uncaring face lightened into a small smile as his eyes became warmer and happier. Just like that.
"Yeah, no." He spoke up and lifted his head. "I want to do it. Nothing'd tick me off more than him dying in some random place." He smiled, but it didn't reach his eyes.
"Karma-kun." The voice of their teacher rang out. He was walking towards them. "I've certainly taken good care of you today haven't I?" Again, green stripes appeared on his face, showing that he was overconfident. "You can still try to kill me, you know. I can polish you up even shinier." He clasped two tentacle fingers he had on one tentacle hand.
Karma smiled again and stood up. "Just to make sure...." his hair flowed gently with the wind as he faced his teacher. "You are a teacher, right?"
"Yes." His teacher replied. The other two looked at him in mild confusion.
"And you would, say, risk your life to protect one of your students?" His smile was full of confidence. You suddenly thought of something. Are you going to—?!
"Of course, I'm a teacher, after all."
No, you can't be. Don't risk it just for that. You looked at him, bewildered. After all, you treasured your own life, right?
"Okay, good." The smile had never left his lips.
Right?
"Then I can kill you." He took out the gun from his blazer, and let his body free fall backwards. Down the cliff. "For sure."
Nagisa immediately turned back and ran toward his friend, but it was too late.
You just stood there and hadn't overcome your own shock yet, realizing that he indeed risked his life to kill their yellow teacher. It was too late.
So, what will it be? He was falling to his death, yet on his face was glee. His gun hand stayed steady, pointing at the top of the cliff, where he stood just seconds ago. If you come to help, I'll shoot you before you can save me. If you just let me die, your life as a teacher is over.
  "Hah." Oh, the irony! 'I'll be on your side'? So where were you? Where were you when I need you? Aren't you the type of teacher that only wants money and fame? You only sided with me for my fame, my achievements, but never for my feelings! "Ahahahahahah!"
  A bitter laugh.
  "Oh, man! It's all flashing before my eyes!"
  A signal of death.
"Are you all right, senpai?"
  A question, asked by him, as he saved a student from being bullied.
"3-E? You mean that 3-E? How awful it must be to have your fate decided in such a way."
  No hatred, no disgust. Only sympathy, and sincerity.
  For he sided with "justice", he never hated or think that students in E class are a blot to human race. He only thought they haven't tried hard enough, and didn't deserve such a mistreat.
  "Huh? I'm in the right here."
  A reply.
"What's wrong with saving a bullied student?"
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  "No, Akabane."
  Here the teacher was, looking at him in hatred.
  I thought you sided with me as long as I am in the right?
  Right now, I am in the right.
  So where were you?
  "No matter how you look at it, you're in the wrong!"
  How?
What's wrong with saving a bullied student?
  The teacher and the bandaged student, all scowling at him like he was a thorn in the eye.
"Have you lost your mind?!"
  No, why?
"Where do you get off, injuring the best student in Year 3?"
  What about the bullied senpai?
"Huh?"
  Have you not think about him?
  "No, wait, sensei—"
  "You sided with the E class and hurt someone who still had a bright future!"
  What about the E class senpai?
  He needed a second chance.
"If this affects his exams, it'll be on my head!"
  So, only your reputation matters?
  Oh, I see.
So much for being on my side.
  .
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Crap. He's dying.
"Your scores are the only thing that is right about you."
Only my score matters then?
All right.
"They're the only reason I've always looked the other way."
Ahh, I see.
"But once you start hurting my career, it's a different story."
In my eyes, this teacher is dying.
Skin shattering, revealed only a talking skull.
"I put in for your transfer."
  "Congratulations, Akabane."
  "You will be starting your third year in class E."
"Aargh!!"
This teacher. He let me down.
Now he's dead to me.
The whole office was messed up.
He walked away, the lights in his eyes vanished, like it was only an illusion.
Everything was just a lie. A lie his teacher baked up to make him believe he is there for him.
But no, I won't be that childish anymore.
I won't be gullible anymore. I won't trust anyone anymore.
Koro-sensei! I will kill you with my own two hands! Now, which death do you choose?
  "Huh?"
  He fell down a sticky yellow net that resembled a spiderweb. He couldn't move.
  "Karma-kun?" A voice. From below him.
  Indeed, it was his homeroom teacher below him, who made the net from his own tentacles. "Splendid job on the premeditated assassination starring yourself. If I'd saved you at Mach speed, your body wouldn't have been able to make it. If I'd move slowly, I'd have been hit."
  His round head poked up between tentacles, beside the student. Karma tried to lift himself up again. It didn't work. "So I thought I'd try a stickier approach."
  "Damn! What can't these tentacles do?" No matter how much strength he gathered, he still can't escape the net and shoot his teacher.
  "You can't shoot me now~" Koro-sensei appeared in another hole of the spiderweb-like net. He laughed his iconic laugh. And appeared in another hole so fast that Karma's eyes could not catch.
  "Ah, and for the record: Letting you die is not an option for me."
  Some light peeked through, making the scene more beautiful as the teacher gently said to him. "Feel free to take a leap of faith any time you like."
  Karma was truly taken aback by the teacher's words. Said teacher grinned at him, his permanent grin on his face. He smiled genuinely, and relaxed into the net, closing his eyes.
It's no use. He won't die, no matter what I do.
  Not the teacher part of him, anyway.
———————————————————
  "It was a lot crazier than you make it seem, Karma." You state as you examined the cliff.
  "You made us worried sick!" Nagisa exclaimed with a concerned face.
  "Eh, it was no biggie." Karma said as if falling nearly to death was an everyday thing to him. "As far as I could see, that would've been my best chance at killing him."
  "Oh? Out of ideas already?" Koro-sensei's voice faked hurt. "But I have so many ways to pamper you in retaliation!" He raised message tools, skin care mask, and a lot more on his tentacles. "You're kind of a pushover yourself, aren't you?!" He mocked Karma.
  Karma could feel his little peace at heart shattered.
I'm still feeling murderous. He stood up and return the smile on his face.
  But this time it's different somehow.
  He sliced his thumb across his neck, as a sign. "Oh, I'll kill you. Maybe even tomorrow."
  Their teacher showed a correct sign on his now scarlet face. "A healthy and refreshing bloodlust. Looks like you don't need any more of my special care."
  Nagisa smiled. And then Karma pointed his thumb backward in your direction. "I don't, but maybe she does."
  "Ah yes, but she needs to make an attempt to receive my special care!" Here we go again, those green stripes!
  You could feel your face darkening. "Ah, no thank you. I don't need special care."
  "Don't deny it!" Koro-sensei's mischievous side surfaced again as he exclaimed.
  "Let's head back," Karma played with a purse. "We can eat on the way, Nagisa and Y/N."
  "Hn? Aaah! That's my purse!" The yellow teacher panicked as sweat glistened visibly on his face.
  "Then who left it in the staff room unattended?" The red head turned back and stopped playing with the purse that wasn't his.
  "Give it back!"
  "If you say so." Karma threw the purse back. The octopoid teacher caught it cautiously and opened the purse only to see an empty void. "But... this is empty!" He illustrated it by holding the purse upside down.
  "There wasn't much in it to begin with. Call it a donation." The famed bad boy smiled and shrugged.
  "Uwahhhh!" The teacher was then in his own despair. He scolded Karma childishly and calling him names.
  "You hypocritical delinquent! Don't you know I saved up just to....!"
Assassins go in for the kill and wind up sparkling clean in their target's tentacles. Nagisa only smiled helplessly at the scene, while Karma grinned at the teacher who was still busy scolding him. That is our assassination classroom.
—————————————( ;-;)——————————
Finally! I'm sorry for finishing it so late
Words: 8725
I made it longer, as you guys can see. Well, because I had to finish it quickly (not your fault, guys, only that we are going to have the end-of-term test) plus I was having a write block so I haven't think more creatively and as a result Y/N seems like an outsider. Sorry!
Finished on 22nd November 2020