(Y/n) p.o.v

Right after arrival, the octopus started his job as our teacher. It may sound strange but trying to shoot someone with a gun has become the norm for everyone in class. We even have a cute little ritual, that we fire at him nonstop during roll call.

Not that I believe we'll actually hit him but I guess it can be aiming practice for my classsmates. After observing their first few tries at shooting a gun, I realized that the only kind of knowledge they have is from video games, at best. None of them really know how to handle a real gun.

During lunch, the octopus is currently in China, I notice Terasuka and his buddies walk of with Nagisa. I wondered what they could possibly have to chat about but I didn't follow them.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~timeskip~~~~~~~~~~~~~~~~~~~~~~~~~~

Was tentacles all along. Really? Not only did our teacher return with a freaking missle but he gave us an almost impossible assignment as a souvenir. No one could make up an acceptable poem that ends with that line. Well maybe a being powerful enough to destroy the freaking moon could... oh wait, I guess that would describe the octopus.

The green haired girl called Kayano raised her hand just as the octopus' face was about to turn pink and asked for his name. The octopus looked thrown off by the question and hesitantely answered that he in fact doesn't have a name. Then his face turned pinkish again.

If I were assigned to assassinate him right then and there, I wiuld have picked this moment. All signs turn to it being just perfect. Suddenly, Nagisa stands up and starts walking towards the octopus. I see one of those green rubber knives hidden behind his assignment sheet. Although I immediately realize that a knife wiuld be way too slow.

Besides that, Nagisa was doing a great job. I couldn't feel any bloodlust coming from him. By the time Nagisa reached our teacher, everyone was paying attention to the scene. Nagisa pulled out his knife and tried to stab the octopus which (as I predicted) failed. Then something rather unexpected happened.

Nagisa hugged the octopus and I could see a small grenade ariund his neck. I ran to the front row and pulled down Isogai, a kid with brown hair who had stood up in order to see better. As soon as we hit the ground, the grenade around the bluenettes neck exploded and those pink bullets scattered all across the room.

My classmates shrieked and ducked while Terasuka was smirking victoriously. When the blast ended he ran to the front talking smack like he had killed the octopus. I knew better though. I saw our teacher on the ceiling glaring at Terasuka. At the same time, everyone was worried about Nagisas well-being, myself included. I mean I knew that that amount of gunpowder wouldn't kill him but his injuries could be severe.

Our faces all had surprised expressions when we realized that Nagisa didn't even have a scratch on him. He was wrapped in some yellow, plastic looking blanket and his eyes were shut close. Nice reflexes.. if he had kept his eyes open without being protected by the yellow blanket thingey, he would have most definately lost his eyesight.

Just as everyone was beginning to wonder about the "corpse", the octopus finally spoke up. His face started twisting in rage (which kind of made him look like some wrinkled tangerine) and he turned pitch black. The atmosphere started changing. The wrinkled tangerine dipped in ink- I mean the octopus dissapeared and returned seconds after he had vanished. In his tentacles he held the name plates of our houses.

As Terasuka and his friends started blaming everything on Nagisa, our teacher interrupted them. "Here's the deal kiddos, the agreement I have with your government forbids me from harming you but there's a catch. If you pull another irresponsible stunt like that again, there's nothing that says I can't harm someone else. Family, friends, everyone in the world except for you if I feel like it." Those words itched themselves into our minds and sent a clear message. Although it didn't matter to me that much since I love alone anyway. It's not like the octopus would find anyone he could kill. Well I'd be upset if he killed Karma or Asano but Karma is his student too and Asano is the freaking principals son. Somthere wasn't really any chance in that happening.

Everyone suddenly realized how hard killing our teacher was going to be. Terasukas face paled in fear and he lashed out on the octopus saying, that they were just defending themselves. Just then, the octopus went from 100 to 0. His face turned red like it always dies when we do something right and the heavy atmosphere dissapeared like it had never even been there in the first place.

Then our teacher did his job and gave us a motivational speech, graded Nagisas awesome technique in assassination and  made sure to tell us that we "must believe ourselves worthy of our target" which is basic knowledge in assassination and basically means: don't kill yourself in order to kill someone else.

Then Kayano asked what 'unkillable' meant in Kanji. After a short moment of silence I said:"Korosenai"

(A/N: I seriously hope that I spelled korosenai correctly xD)

The green headed girl repeated the line. "Korosenai... Korosensei... Koro-sensei! That would be a perfect name for you, sir!" And everybody agreed, although I didn't think that the whole octopus thing would go away anytime soon.

So we named our unkillable teacher Koro-sensei...

...even if no one is unkillable for you~