Relief and worry filled everyone once Izuku arrived.

"Mandalay!" shouted Eraserhead.

"Reinstate the barrier!" ordered Mandalay. The electric barrier went up instantly, and Shigaraki slammed into getting zapped heavily. 

"I'm sorry it took my so long!" apologized Midoriya bouncing back to Mirio. "Is everyone all-" He looked back, his sentence stopped short... his eyes directly on Katsuki Bakugo lying motionless...everything around him felt frozen..."Ka--"

"Do you wanna tell them why you're late?" asked Shigaraki, he was taunting him. "I'm sure you have an excuse. Toga's the one to blame, right? Izuku Midoriya?" He got on his hands. "Why don't you say something? How about, 'Nobody expected this to happen?' or maybe 'It couldn't be helped.' Go on. Avoid taking responsibility." Izuku bent over in extreme sorrow and anger, he began to cry. "Just like everybody else does." Blackwhip exploded from his body once he made a fist, then the purple mist, his quirks were going out of control, his eyes glowed green. "That's right. Get mad. Anger makes you predictable. When you attack, I'll sever your spine. Come at me! I hope you like the present. Sorry, it wasn't wrapped. "

"We haven't lost yet, Deku!" shouted Mirio, appearing the storm of Izuku's wrath. 

"Him again," growled Shigaraki. 

Mirio grabbed Izuku's shoulders. "I know you're feeling super guilty. Gutted. But stay strong. That's what he wants. He's trying to turn you against yourself. We're okay, though. Tamaki and the others are still breathing. And Edgeshot is doing everything he can to save Bakugo's life as we speak. You have to trust him. I know he'll succeed. We will win this! That's the mindset you need to win this battle with. We haven't lost a single thing that can't be regained yet. And we're not giving up this fight!"

"You're trying to fill his head with delusions," said Shigaraki. "That's called running away from reality."

"Maybe you're forgetting that we're heroes," said Mirio, looking back at Izuku. "If we don't keep fighting and chasing our ideal futures, then who's going to make sure they become reality?"

Izuku thought back to a conversation with All Might, to the pilots, to Banjo telling him its fine to get mad. He thought back to Eva and the exercises she gave him to control his emotions. His powers died down, his eyes went back to normal, and he then tapped his heart.

"You're right, Lemillion. I'm sorry."

"Save your apologies for after we've won this war, hero," said Lemillion with a smile. "We can sit down with Violet Gust." Izuku smiled, nodding his head. 

"That is if we can get her to leave Kacchan's side at the hospital," said Izuku. he could just see Eva fussing over him as he told her he was fine. His voice changed to growl, looking at Shigaraki. "All For One." He looked up, eyes went green again, users, 3,4,6, and 7th appeared. "Tell me, is Shigaraki still somewhere inside that body?" Mirio gasped. 

"Now, that is an interesting question," admitted Shigaraki. "Tomura Shigaraki, huh?" He paused. "That person no longer exists. What you see before you is two people who've melded into a single being. Though All For One is the consciousness in charge, perhaps because he's been alive longer

***

Deep inside, Tenko started to try to push his way out, All For One's hands pushed him back in.

***

"I don't know what your plan is or how intend to approach this fight, but don't think for a second that there's a happy ending for you," warned Shigaraki. "Izuku Midoriya."

"Two people fused together inside one body?" asked Mirio. "That's not true. Least, not from what I've seen. I said something kinda mean earlier, and it was like another person reacted." He did a small recap. "He got crazy upset. Panicky. He acted like a little kid. It was almost like he was possessed by someone else. It honestly didn't seem like they were totally unified to me."

"Eva mentioned things like that happening in the cave," said Izuku. "When he wasn't in her pocket of it." Mirio nodded. "That...that could have been Tenko. She was very concerned for his well-being." 

***

Deep inside, little Tenko heard this; his head lifted

****

 "And after that, the battle changed. Suddenly, whenever he got hit, you could tell he was affected by it," Mirio explained more. "He was showing weakness."

Nana studied the appearance of her grandson, She was surprised his fingers, faces appeared he saw her son's head as one of his fingers. 

"Izuku...he's still in there." Izuku straightened up. "Look!" 

Shigaraki lept up with so much force it made the flying fortress tilt.

"We're fine," Aizawa assured Monoma. "Keep your eyes open."

"Say what you want," said Shigaraki. "I DON'T CARE!" He got ready to punch, Mirio dipped out of sight. " I'M COMING FOR MY BROTHER!" Their fists collided, making the ground tear up massively. 

"You should prepare yourself," warned Izuku. "Because I guarantee you're not getting a happy ending, either!" He used black whip with Fa Jin stored inside, wrapped it around Shigaraki's arm mutation, and threw him over his shoulder. Shigaraki slammed into a floating spot, landing on another. 

"Boosted for nothing," said Shigaraki. "That move's not going to work twi--" He gasped, seeing Izuku appear on another platform.

"If you don't use this then its over," warned Kudo. "If you don't defeat him in the next five minutes, the world will fall."

"I'm going to stop you," declared Izuku. he began to use Kudos' quirk. "Second. Transmission!" He suddenly appeared in front of Shigaraki, giving him heavy punches. "Second Gear! Third Gear! Top Gear!" Shigaraki spat out lots of blood, the platform slammed into the ground, breaking apart."

Mirio was tending to Miriko. "Did he just break the sound barrier?"

"What has he done?" asked Shigaraki as he continued to fly up. "Where did he go?" This isn't like that glowing energy from earlier. He's too fast! Don't tell me. The ability to change a person's speed after touching them--"

"Gearshift," said Izuku, continuing his attack. "Overdrive!"

Izuku was over Shigaraki, glowing in blue. "DETROIT SMASH!"

In the midst of the battle, vestiges of Yoichi and All For One looked at each other.

Shigaraki slammed into the ground, creating large waves of aftershock. Izuku remained in the sky, glowing blue for all to see. 

Izuku shot back to Shigaraki with another Detroit Smash. "Quintuple!" More of the ground was torn up. Shigarki leaped forward to punch, missing Izuku greatly. 

"There I have you now! " shouted Shigaraki, going into attack again. Izuku used smoke screen. "Cheap trick." Shiagraki jolted forward, seeing that Izuku was dragging him up with black whip. "From above?" Izuku stared down planning his next 8 moves, using all of the quirks stored in One For All. "This is it, All For One!"

"Shut up, damnit!" cried Shigaraki.

"Your fight is over!" declared Izuku." Down below, Mirio had transported the injured off to the side for safety, Edgeshot continued to work on Bakugo, Lord Corpse tending to Best Jeanist.

"INSIGNIFICANT PESTS, EVERY LAST ONE OF YOU!" yelled Shigaraki. 

"I WON'T ALLOW YOU TO HURT ANYBODY ELSE!" Izuku yelled back. Izuku started to punch through the mutated arm, everyone watched with awe. THe mutations tore apart, letting Izuku landed the punch on Shigaraki's core, rainbow colors shined everywhere. Time seemed to have stop as they waited for the next turn of events. 

"Attacking me with every power avaibable to you, all of your quirks," said Shigaraki. "You're trying to make me look like a fool, 'cause I haven't used a single one of mine yet. You can't imagine the true power this body holds. This is their fault. Eraser Head and those brats with their underhanded methods. That demon fae using information she gathered, trying to abrupt my plans. I'm going to kill her right after this. The arena's to blame, too. And the trick they used to split us up. All of it!" All For One's voice started to sound out a bit. "You wanted to talk a series of terrible events! You know nothing!"

"Remember, Yuki thinks he is beyond redemption too," Kudo said Izuku. "And the person in control is not the person she fell in love with." Izuku nodded. "She cried last night, saying she should have held him tighter, aware of what his fate was to become."

***

Deep inside, Shigaraki tied down by All For One overhead this as well. He stared at the ground, he was not angry, but he felt the same as her in some sense.

***

Outside, Shigaraki arched back screaming in pain, as inside of his body push up violently out of his body.

"I'm not done," declared All For One.