--- a few days ago ---

"I am here! Like I am every day!" All Might says as he punches the air.

"Hey... you seem really energetic" Kyoka says as she looks at All Might.

"Yeah! Who would've guessed!" All Might says as he looks at Kyoka.

"Tsucauchi-san, and the principal, too" Sato says as he takes his gloves off.

"Are you here about Aoyama?" Momo asks sternly.

"And what comes after" All Might says as he puts his arms out to the side, "right now, we are only telling a selected number of people. We will now discuss the final plan for the second decisive battle. First, there is the fact that currently, the pro heroes are searching high and low for All For One, but their chances of finding him seem pretty low". 

"Bakugo said something like that, too" Denki says as he pulls himself up off of the floor. 

"But to hear it all laid out like that" Sato says as he folds his arms. 

"Does it mean there's no point?" Mineta asks from next to Denki. 

"No, it's the opposite" Tsucauchi says as he looks at Mineta, "it'll tie together with Eraser's plan". 

With Mr Aizawa's plan... 

Izuku says as he remembers the facetime everyone had during the Aoyama's interrogation. 

"In order to draw out a cunning bastard, you have to slowly soften his heart" All Might says as he puts his hands out in front of him. 

"So pretend like "we've searched desperately but still can't find him. What the hell, scum"?" Katsuki says as he adjusts his gauntlets. 

"That's an interesting way to put it" Koko says with a sigh. 

"We'll proceed on the assumption that Search is working" Tsucauchi says as he brings out some paperwork, "All For One should be minutely aware of all our movements. We'll show him that our efforts since Midoriya-kun and Koko-chan's return are resulting in frustration and exhaustion. We'll make him think we're making one bad move after another and make him feel good thinking everything is going according to his plan. We'll use Eraser's plan to use the informant, Aoyama, to lure All For One somewhere. And if we bring Koko-chan and Midoriya-kun out, too, this will solidify this further. We're hoping to increase that plan's chances of success". '

"Then, Aoyama is-" Izuku says with a gasp. 

"I'm so glad!" Toru says as she hugs Ochaco. 

"Aoyama..." Mina says as she starts to cry. 

"Excuse me, but what about what Aoyama's Father said?" Momo asks worriedly, "he said if they lie to All For One, they'll be killed. If we don't know how he can tell what is a lie, then isn't there still some danger to Aoyama and his family?". 

"We have a plan for that, too" All Might says as he looks at Momo, "according to Mr and Mrs Aoyama, All For One only contacts them through a voice call. They have no written contact. He likely had many such other "friends", so I don't think he scrutinises everything they say carefully before acting. His system can probably tell immediately by their voices if someone is lying. Therefore, if there is no lie in that audio, then he can show up without fear. That's why we'll use Aizawa-kun's plan and use him!" he says as he opens the door again, "come on!". 

"Hey" Shinso says as he walks inside. 

"Shinso!" Mineta shouts happily. 

"Your costume's so cool!" Kirishima says as Shinso walks over. 

"I was surprised when I heard the details of the plan from Mr Aizawa" Tsuyu says as she touches her finger to her chin, "because during the combat battles... you said some different things that I remember clearly". 

"Look at this mess" Shinso says as he rubs the back of his neck, "I thought I'd be transferring to the hero course in April and competing with you all. I kept training to improve my Quirk so I could do that, but I didn't think we wouldn't be able to move onto the next grade". 

"Improve your Quirk. So you really can?" Tsuyu asks happily. 

"Yeah, I can do it" Shinso says as he holds onto his capture scarf, "if I control Aoyama and his parents and make them talk, then neither my will nor their feelings will get in the way". 

"Wow!" the class shout happily. 

"But in order to do that, it's harder to activate" Shinso says with a sigh. 

"You're amazing!" Kirishima says as he balls his fists. 

"Thanks, Shinso!" Denki says with a smile. 

"Will you be in Class A? Class B?" Koda asks happily. 

"Join Class A! A!" Sato says as he goes over to Shinso. 

"What's your hero name?" Ojiro asks as he tails sways from side to side. 

They're so cheerful... what's with these guys? 

Shinso says calmly. 

"Shinso was able to train his Quirk thanks to Aizawa-kun and Koko-chan's help" Nezu says as he puts his hand up. 

"As expected, the father, daughter duo is amazing!" the class say as they punch the air. 

"By the way, Shinso doesn't have his provisional licence yet, but since it's an emergency, we got special permission from the acting chairman, Mera" Nezu says as he points to the class. 

"But isn't the problem what comes next?" Tokoyami asks as he puts his hand up, "we're supposed to lure out the villains and round them up all at once? Is that possible? Even if there are less heroes now, if a large number of us gather in one place, then won't that give us away?". 

"It'll be fine if they aren't there" All Might says as he lifts one finger. 

"In order to make that work, there's another key person we need" Tsucauchi says as he stands beside All Might. 

--- at the new Tartarus prison ---

"Are you ready to do this again, Oboro Shirakumo?" Koko asks as she stands in Kurogiri, or should I say, Oboro Shirakumo's cell, "I'm gonna get you back to my Dad no matter what it takes. Even if it kills me to do so". 

Koko walks to Kurogiri as she puts her hand on his shoulder. Aizawa and Vlad watch her body goes limp for a second. Aizawa watches as Koko's body shakes, small noises leaving her mouth. Suddenly, Koko is pushed back through the glass as he and Vlad catch her. 

"Koko, what happened?" Aizawa asks as he looks down at Koko. 

"I found him, Dad" Koko says as she lets out some shaky breaths, "he's in there. He's fighting". 

--- present day ---

Monama laughs uncontrollably as he uses Kurogiri's warp to bring all of the heroes together. 

"I'm the one pulling the strings!" Monama cackles as All For One realises it's Monama using Kurogiri's Quirk, not Koko. 

As expected, he brought a large army with him. All squads, move! 

Tsucauchi says through the in ear pieces. 

If he gets even an ounce of Koko's All For One or Midoriya's One For All, then there's no need for him to run and hide anymore! They'll end it here... and this is where they're planning to start! 

All Might says through the in ear pieces as some of the smaller, less known villains run forwards. Tomura goes to touch the ground when he looks over at Koko who looks at him with a desperate look on her face. Suddenly, Koko releases a translucent form of herself from her body, from when she was younger, when she was known as Tsuki, as Tsuki runs towards Tomura, Tomura stopping himself. 

"Dabi" Tomura says as he glances over to Touya. 

"Don't tell me what to do, leader" Touya says as he runs forward, pushing some flames towards Tsuki. 

Tsuki ducks down under the flames as she slides on the ground, throwing herself at Tomura as she disappears into Tomura as he's pushed back. 

With Tsuki inside, she'll be able to find Tenko. After all, Tsuki is the version of me Ten will recognise the most. 

Koko says as she sighs.  

"I didn't think I'd get to see you here, Dad!" Touya says as he looks at Endeavour, "but first, a funeral for your friends?". 

Shoto throws out an ice wall that blocks Touya's attack. 

"I won't let you, stupid brother!" Shoto says as he appears through the warp. 

"Shoto!" Touya says happily, "

"You're gathering in droves... are you planning a free for all here?" All For One asks as he looks at all of the heroes. 

Activate System Troy! 

All Might says as multiple pieces of machinery come from the ground, dropping around the villains as it catches them inside. 

"Cages?" Touya asks as he looks around. 

"I'll catch you soon, Ten" Koko says as she looks at Tomura for the last time, knowing she's going to be split off from him. 

"You think these'll hold us?" Touya asks as he punches the cage. 

"They should know that these will be torn apart within seconds" All For One says as he floats at the top of the cage, "so why did they use it at such a large scale?". 

The cages start to move using the jets on them as Monama opens up more warps, the cages getting closer towards them. The heroes use all their might to push the cages closer to the warps. The heroes follow which cages have the villains they're going to fight inside. Katsuki and Izuku are about to go to the one with Tomura in it when something grabs Izuku, pulling him towards the one where Toga is going. 

"Deku!" Katsuki shouts. 

"Izuku!" Koko says worriedly as she tries to go to him. 

"Koko, no. Midoriya is going to Ten. You can't fight against him, remember?" Keigo says as he grabs Koko's wrist. 

"But Izuku's going the wrong way!" Koko says as she looks at Keigo, the two of them being pulled through the warp. 

Fat! Get the ones who're left! Take command! I'm leaving Young Aoyama to you!

"Roger!" Fat Gum says as he walks over to Aoyama, putting a hand on his shoulder, ""we will defeat you here!". That was a good bluff!". 

"M-M-M-Merci!" Aoyama says as he shuts his eyes. 

Young Monama, return to Aizawa!

"Yep" Monama says as he dives back into the warp. 

--- where All Might and the police force are ---

"We've successfully split them up!" All Might says as he looks at the map, seeing all of the identification numbers of the heroes, "if it weren't for Young Koko, we wouldn't know where everyone is". 

--- two days ago ---

"We need something so we can identify all of you" Tsucauchi says as all of the heroes and students involved in the final battle stand in the meeting room, "drones would be too obvious and in ear pieces would be destroyed by Tomura Shigaraki and All For One's radio waves. Does anyone have any ideas?". 

Everyone looks around, waiting for someone to come up with something. Shoto looks at Koko and he sees her feeling uncomfortable. 

"Are you alright?" Shoto asks as he whispers into her ear. 

"I have an idea but I don't know how many people will be on board with it" Koko says as she looks at Shoto. 

"It can't hurt to try it" Shoto says as he gives her a reassuring smile. 

"You're right" Koko says with a nod, "Tsucauchi-san!" she says as she puts her hand up.

"Yes, Koko?" Tsucauchi says as he looks at her. 

"My brother, Tomura, and I used to have trackers out Father had implanted in our arms from a young age" Koko says as she stands up, "now, these trackers were so strong that we could sense when each of us were close. Now, these trackers didn't allow us to communicate with each other, but I have an idea. I can use the radio waves Quirk I stole from my Father on the night of Camino attack to create a radio frequency no one will be able to get into contact with. I will install these into the implant and I will put them behind the ear so we can hear each other talking. Would you be willing to try it?". 

"I'll be the first volunteer to see if it works" Shoto says as he puts his hand up. 

"Us, too" Izuku says as he stands up, dragging Katsuki with him. 

"We'll give it a go" Tsucauchi says as Koko nods. 

--- present day ---

"We will now move onto Phase Two!" All Might says as red markers appear all over the screen. 

--- at the Gunga Villa Site ---

All For One appears at the site and he sees a warp appear in front of him, heroes like Endeavour, Kamui Woods, and Hawks coming out, Koko, his own daughter, as well. 

"This is-" All For One says as he looks around. 

"Welcome!" Keigo shouts as he flies behind All For One, using some of his feathers to hit All For One's mask, the attack not really doing much damage physically. 

"Gunga Villa..." All For One says as he looks down at the ground, remembering the large villa that was once structured there, "I see". 

"Sorry, Endeavour-san" Keigo says as he flies back over to Endeavour, "I guess he's not going to come wearing stuff I can cut through". 

"Don't worry. I wasn't expecting you to" Endeavour says as the warp disappears from behind him, "we figured out that the sludgy warp you have is a lesser version of Kurogiri's at the battle in Camino. The warping distance is much shorter, and you can't warp yourself. The U.A. barrier was also strengthened to account for that. This is all a result of your conceit, the consequences of your own actions!". 

"Splitting us up and attacking us separately" All For One says as he recalls the plans the heroes made, "it's a great plan! But you need to take into consideration whether or not you can win. Even if you've split up your forces because you've lost so many heroes, you really are a cruel man, Endeavour. Did you pit One For All against Tomura? That's a huge risk. However, I have one question, for my lovely daughter. Why come fight your deal, old Dad? I thought you'd want to be close to your brother". 

"I can't attack Tomura without holding back because I know my brother is in there. Attacking you, well that, I have no problem with. I'd be happy if you were to die by my hand, Father. Oh, and while I do it, I'll shut my eyes so the last thing you'll ever see won't be the eyes you love so much" Koko says as she flames her hands, "oh, but don't think I've left Tomura alone. Before we got split off, I sent a piece of my soul to go find the real Tenko. Tsuki. Tsuki Shimura. My favourite identity of myself. The part of my soul which saves the last memory of my Mother. And Izuku and Katsuki there and you know how much those boys used to love playing heroes with Ten. We're going to get him back, and when I do, I'll kill you without any regrets". 

"You can try all you want, Koko. But know this. I'm your Father, and you cannot betray your own blood" All For One says as he glances over at Endeavour, "oh, I forgot" he says with a slight chuckle, "you did that, though, didn't you, Endeavour? Maybe it's the cruellest match up of all- putting your youngest child in the difficult situation of cleaning up your mess, and continuing the abuse against your eldest!". 

--- at the police hideout ---

"We've split up the villains according to plan!" Tsucauchi says as he looks around at everyone, "it appears the fights have commenced at each location. The real battle starts now, All Might". 

"Yeah" All Might says as he looks at Tsucauchi. 

--- U.A. coffin in the sky ---

Tomura is thrown through the warp, into the U.A. barrier as he looks around. 

U.A., what is this place? 

Tomura says as more warps appear across from him. 

"Denim Head, this is bad!" Katsuki yells as he looks at Best Jeanist, "they got us! Deku's- Deku's not here!". 

--- on Okuto Island ---

Izuku groans as he's pulled through the warp by whatever got wrapped around his wrist. 

"Deku-kun?!" Ochaco says confused as Izuku lands near her, "why? Shouldn't you be with Shigaraki?". 

Danger Sense didn't activate! Himiko Toga... 

Izuku says as he looks at Toga. 

--- U.A. coffin in the sky ---

"Deku-kun's not here?" Best Jeanist says as he questions what went wrong, "what happened?". 

"I don't know!" Katsuki yells as he lands on the ground, "he was pulled somewhere else!". 

"I-Isn't this bad?" Tamaki asks as he steps onto the ground, "without him, we can't fight like we were planning. 

"We have to tell the others!" Nejire says as she looks at Best Jeanist. 

"Whatever, let's just do this!" Mirko says as she punches her hand to her palm, "it's already started- the fight against the greatest villain in recorded history!". 

The ground's so far down... I'm in the sky. Floating. No jailbreakers or Front members were brought here. Just me. Oh well. Don't get in my way this time, Me. 

Tomura says as he lands on the ground. He crouches down, putting his hand on the ground as he breaks it up using his Decay. He looks down and realises there's only a few inches of ground before it's metal underneath. The metal moves up as it pushes Tomura up as well. It throws him into the barrier which electrocutes him. 

An electromagnetic barrier! My body's getting stiff. But- 

Tomura says as he balls his first. 

"Woah there!" Best Jeanist says as he ties Tomura up, "you're fraying apart!" he yells as he throws Tomura to the ground, "as long as you're moving with your brain and muscles, a strong electrical current running through your body will stiffen you up. No matter how strong you are, it'll work for at least a second!". 

Blocks from the ground fly up and disintegrate in the sky... they installed this to prevent Decay from spreading, huh?

Tomura says as he gets up. 

"But- that will lead to your ruin" Tomura says as he looks at everyone, "Jeanist" he says as Best Jeanist tries to tie him up again, "we're floating in the sky, right?" he says as he manages to dodge the relentless attacks, "if you use up your ground that fast, your precious stage will disappear!". 

"No need to worry" Best Jeanist says as he gestures to behind him, "we have plenty of raw material" he says as new ground is installed, the grass forming over the metal again from where Tomura laid his attack, "don't you understand yet, Shigaraki? Has your brain short circuited? This place was created to defeat you- the Coffin in the Sky!". 

--- underground the coffin in the sky ---

"Plates F10-35 and G10-45 have been damaged" Power Loader says as he comes onto a balcony. 

"Okay! We'll replace them right away" Cementos says as he looks up at Power Loader, "let's go, everyone" he says as he puts his hands on the ground, bringing up some cement. 

"Parts please" Hatsume says as she drills a new plate together, "um, what was your name again?". 

"Creati" Momo says as she starts to make the parts Hatsume needs, "my friends call me Yao-momo! Please call me what you wish". 

--- in the coffin in the sky ---

"With you widespread attacks that cause instant death and speed of All Might at his peak, we needed to figure out where to detain you" Best Jeanist says as he holds his arms out in front of him, "the two battles we fought against you after you awakened showed us the way. A mere 16-year-old girl made this possible. The evacuation system suggested by the principal was added to the countermeasures against Decay. Splitting the area blocks into even smaller sections and turning them into drones with an updated program. There wasn't enough raw materials due to the collapse of the supply chain, it needed to be constructed in a short time frame, and a lot of energy was needed for its movement and the electromagnetic barrier". 

--- in a section connected to the coffin in the sky ---

"Wow! Manga, isn't this crazy?" Denki says as he, Manga and two other students stand in the middle of an electromagnetic current, "you feeling it?". 

"It's like I'm screaming "whoa"!" Manga says as he looks at Denki. 

"First years, focus!" one of the students says as she looks at Denki and Manga. 

"We're basically second years, though. Right, Manga?" Denki says with a smile. 

"We're the cornerstones!" Manga says as his whole body pulsates with energy, "let's do our best so we can keep Shigaraki locked up!". 

"Yeah!" Denki says as his smile turns into a smirk, "charge your best, Chargebolt!". 

--- in the coffin in the sky ---

"Everything that we've done up until now is powering this coffin!" Best Jeanist says as he remembers everyone's hard work up until this point, "it's not for fame or glory. We are just doing this because we want to protect our future. We are the ones who will stop your destruction!". 

Katsuki rises up from behind Shigaraki as he sends an explosion towards Tomura. Tomura dodges out of the way as Nejire flies in from below, wrapping the explosion up with her energy as she throws it up towards Tomura. The attack doesn't land, but Mirko uses Best Jeanist's wires to run along, jumping on the floating platform as she jumps towards Tomura, kicking at him as he dodges that as well. 

"It's time to stop showing off your toys" Tomura says as he looks at Best Jeanist, a hand outstretched to his side. 

"It's no use!" Katsuki shouts down to Tomura, "do you remember that shitty game we played at Jaku?". 

My Quirk...

Tomura says as he realises that he can't use any of his Quirks. Tomura lands on the ground as he looks outside the barrier at the section connected which is powering the whole coffin in the sky as he sees three people sitting on the rooftop of the building. Monama laughs uncontrollably as Manual uses his Quirk to keep moisture flowing into Monama's eyes, Monama's hand touching Aizawa's, who is sitting right next to Monama, also using his Quirk. 

"You don't like Erasure, right, Mr Last Boss?" Monama says as he tilts his head. 

"Don't move. You'll be out of position" Manual says worriedly. 

I can't move, but as long as I keep contact with him like this, Monama can use Copy past his limit of five minutes. We were supposed to create an advantageous situation for Midoriya like this with him at the centre of this operation. But... this is bad. Midoriya is not here. On top of that, back then, Shigaraki's body wasn't complete. 

Aizawa says as he keeps his eyes locked on Shigaraki. Katsuki sends an explosion to Tomura but he just jumps off of the ground. Mirko jumps up to him, trying to kick him again but Mirko misses due to Tomura dodging again. Tomura spins in the air, only to reveal a mutated arm with multiple fingers forming out of it. 

"Dynamight, what's that? What can you tell us?" Mirko asks as she shakes her hair out of her face. 

"Dunno! Never seen it-" Katsuki says panicked. 

The fingers catch Mirko up as it breaks of her prosthetic leg. 

"I thought you were cool... I'm really disappointed, Eraserhead" Tomura says as he looks at Aizawa, his arm even longer than it was before.