A/N: Some bullshit happened and I lost this story the first time. The good news is, I've read the light novel for High School DxD. To the people who made the anime, from the bottom of my heart, FUCK YOU!

I will be basing this story on the light novel and anime, but I will also create my own headcanons and backstories for some characters that did not have a proper introduction or backstory in either medium.

After Shigaraki body recovered from his fight against stars and stripes All for one completely takes it over. He is not able to access her quirk after stealing it. But he was able to stop her from destroying all of his other quirks. The vestige of Stars and Stripes is locked away inside of All for one quirk just like Shigaraki consciousness.

All For One's first plan backfires (take stars and stripes quirk and become unstoppable)

Now that he's taken full control over Tomura's body he can put his next plan into action stealing One For All and killing Izuku Midoriya But to do that he's going to need someone's quirk.

Meanwhile, at the police station where Kai Chisaki is being held, two Second Generation Nomus attack the station. A third one with wings then takes overhaul and flies away, allowing All for One to steal his Quirk.

Three weeks later All For One can fully control the overhaul quirk. Now it is time to try an take one for all again before killing Izuku.

UA high school

Izuku Midoriya is training for the inevitable fight against All For One. Everyone has heard about what happened to Chisaki. Izuku can use up to 70% of One For All. He has been training for the past ten hours.

"Young Midoriya, that's enough training for today," All Might said, concerned about his successor. "No, not yet! I need to be able to use 100% of One For All!" Izuku said, while he was flying and kicking the air, practicing combat in the sky. "All For One is out there getting stronger; I have to be able to stop him."

"Young Midoriya, it's good to train, but if you don't get any rest, then you're just torturing yourself."

"I'm fine I can go for another tw-~ izuku never got to finish that sentence as he clasped on the ground."

All Might had to carry Izuku back to his dorm on his back. "He was out training all day, wasn't he?" Uraraka asked when she saw All Might carrying an unconscious Izuku.

"Yeah, he needs to take it easy on his training. We don't know when All For One will strike, so Young Midoriya can't be worn out before the fight even starts." All Might said to Uraraka while placing Izuku back into his bed.

The next day

All Might is looking at U.A. from a distance, surrounded by three third-generation Nomus. Ready for his attack.

Back at U.A., Izuku decided to take All Might's advice. He was sitting on the couch in the lounge, relaxing and writing in his notebook. He was trying to think of some new things he could do with all his quirks. That's when his danger sense went off in his head.

"He's here" Izuku said with a serious tone.

"Who?" asked Class 1A simultaneously.

"All for one," Izuku said as he powered up One For All and ran out of the dorm, only to see All For One in Shigaraki's body hovering over the school.

"Can you save them?" All For One asked before he started to decay the school building, leaving no survivors. "Seriously, did they really think those security upgrades would stop me?" All For One said mocking a dead Principal Nezu.

"Why?" Izuku asked in disbelief, unable to comprehend how all of the people who had taken refuge there were now gone.

"I needed to get rid of all the teachers and pro-heroes I know I can take them on, but I don't want the extra trouble," All For One said, looking down at Izuku who was trembling with sadness and rage.

'All might, mom, koda, eri they are all gone.' Izuku thought to himself.

"It looks like your friends are coming over here," All Might said as he saw Class 1A rushing over. Hearing this, Izuku turned his head to see all of his classmates coming over to him, ready to fight.

"I had expected this which is why I brought some friends to keep them busy." With that, All For One uses his warping quirk to summon three 3rd Generation Nomus.

"Have fun and cause as much chaos as possible, but leave Izuku to me," All For One said to his Nomu, who let out a monstrous roar in response.

Izuku didn't waste any time as he activated One For All while Class 1A prepared to fight off the three Nomus. Izuku used his Black Whip to grab hold of All For One and pulled him towards him. "SMASH!" Izuku yelled out as he punched All For One in the face. At 38%, All For One, who wasn't expecting that, stumbled back a bit.

All for one and Izuku then begin a intense battle.

Class 1-A manages to hold off the Nomu with some teamwork. Mineta uses his Sticky Balls to trap one, while Todoroki covers it in an Ice Glacier. "Die!" Bakugo yells out as he pulls the pin from his gauntlet. Knowing that it can regenerate, Todoroki freezes it again, and Bakugo fires off a bunch of explosions to make sure it can't regenerate. Momo creates more gauntlets for Bakugo to use on the remaining Nomus.

Meanwhile, All For One and Izuku continue their fight with All For One having the advantage due to experience. While they are fighting, All For One managed to knock Izuku out of the sky, landing on his back. Seeing this as an opportunity, he goes up to him and places his hand on his head, attempting to steal One for All.

"Last time, I couldn't take one for all because Shigaraki's body wasn't complete. Now there's nothing stopping me from taking it," All For One said as red lightning started coming out of his hands.

Izuku, along with the remnants of the previous One For All users, found themselves within the Vestige of All For One. They all looked around and noticed a lot of spheres, each with a different color, just floating about.

"Theses must be all the quirks he stolen" Izuku theorized out loud .

"They are!" a voice called out, grabbing their attention. All of the previous One for All users turned around to see a woman chained up and bound to a wall. Izuku quickly recognized her as the number one hero in America, Stars and Stripes.

"Get used to your new home," a voice said, putting them on alert. All For One then appears in his own Vestige World.

"I can appear here whenever I want," All For One said, pointing at Stain and Stripes. "That's how I was able to stop her. As long as she's chained up, she can't use her Quirk, nor can I unfortunately."

All of the previous users stood ready for a fight. But All For One just laughed, "I killed all of you in the real world; what makes you think you can beat me in mine?"

Izuku wasting no time charges at all for one "SMASH" Izuku yells out as he punches all for one in the stomach at 20%One For All. But All For One wasn't even fazed by the hit.

"Physical attacks can't hurt him." Stars and Stripes said.

"how do we beat someone who can't take damage?" Nana said while Izuku comes up with an idea. He Silently communicated his plan to the other users.

Izuku jumped in the air behind All for one making him turn around. 'Step one complete.' Izuku thought to himself.

"Delaware Smash!"Izuku yells out as he does a finger flick at a random wall then another. Then another not even aiming at anything particular.

All for one is very confused and asked "What are you doing" 'Second part complete' Izuku thought As he answers All For One's question "nothing I just needed to create a distraction." Hearing this All For One quickly turned around and was met with a sight he didn't want to see. In front of him stood Stars and Stripes, no longer chained up and able to use her quirk.

"I might not be able to defeat you in here but she can" Stars and Stripes then activated her quirk to destroy Afo quirks. hundreds of floating lights started to Disappear Afo seeing his quirks being destroyed try's to hold onto the quirk he got from overhaul it will be how he plans on killing Izuku.

"I need to send all of them out of here," All For One thought to himself, knowing that he wouldn't be able to take One For All, but at least he would still have some Quirks left over.

All For One opens up a portal, which will lead them back to Izuku's consciousness. They all start getting sucked into it like a vacuum. Unfortunately, the sucking causes the quirk that All For One was protecting to also start floating away from him. As they are all being sucked into the portal, Stars and Stripes sees All For One trying to hold onto a quirk. Thinking that it's important, she grabs it as well, so that All For One can't have it.

Back in reality, only thirty seconds have passed when All For One puts his hand on Izuku's head to try and steal his Quirk. As soon as Izuku comes back to his senses, they are both blasted away from each other. Izuku's classmates and friends come over to help out. After they had finished off the Nomu, All For One, seeing that he may be in trouble, uses his Warp Quirk to summon the League of Villains.

"This is going to be a tough battle, guys. If you want to back out, do it now." Izuku said, to which no one objected. They were determined to see it through until the end.

"Let's kill these bastards," Bakugou said, grinning. And with that, the battle began.

———

Izuku Midoriya was the only one from his class left standing. He couldn't save a single classmate. However, he didn't have time to mourn because All for One was coming at him. 'You're going to die just like the others,' All for One said, lifting Izuku up in the air. He then threw Izuku into a pile of rubble, trying to break him down and steal One for All.

Supreme Kai World

"Sir Majin Buu has gone into hibernation." A pink skinned man said. He had long white hair, and a broad face

"That's good, Kibito," a small purple man said. He too had a white mohawk.

"Why do we take care of him?"

An old man had asked him. He was also purple and had white hair.

"Because great ancestor he is technically a Supreme Kai."

"That's because he absorbed the real one. I'm glad he's asleep. He keeps on turning all our food into sweets. I don't even like chocolate that much."

"Sir, you need to see what is happening on Earth right now," Kibito said as he made the others look into the crystal ball.

"Wow, that kid is on the verge of death. Goku used to protect Earth. But he's been dead for centuries now," Supreme Kai said as he watched Izuku get blasted into a building.

"That boy is clearly not strong enough to beat that man. Kibito, let's go."

Supreme Kai asked, "Where are you going?"

"You just keep watching the crystal ball."

Kibito and Old Kai stand beside the sleeping Buu.

"Kibito can teleport us in front of that boy."

With Izuku

Izuku was just blasted through a building with a air cannon.

Izuku was lying on his back in an old office that had been converted into a room with a bookshelf, a hole in the wall, and a desk split down the middle, with Izuku laying in between both halves of the desk.

"I'm too weak," Izuku said with sadness in his voice.

"You damn right you are." Old Kai said making Izuku lift his head up to see who was talking.

Who are you?", asked Izuku.

"My name is not important. However, I would like you to meet Majin Buu." Old Kai said, pointing at Buu who was still sleeping.

"Huh Buu?"

"I'm going to seal Buu inside of you. You will gain his strength and magical abilities."

"Wait... what can he do?"

"We don't have time for questions. Just search through his memories to find the answer," Old Kai began his spell.

Majin Buu began to glow before disappearing. Izuku could feel a wave of power coursing through him. A mark resembling a "M" appeared on the back of his neck.

Well it's time for us to go Kibito." And with that Old Kai vanished. But not before kibito heals Izuku.

Izuku walked towards the hole in the wall. His green hair covering his eyes. Izuku looked down at All For One with red eyes and A pink aura started surrounding him. The power he felt was intoxicating, he felt like he could do anything.

Flying towards All For One Izuku punched him in the gut with Buu's Ki surrounding him. Upon realizing that the pink aura was giving him a massive strength and agility boost he decided to use it instead of One For All.

All For One was sent flying from Izuku's attack. "What happened, He was knocking on death's door just a moment ago." All For one questioned confused. While All For One was able to get back on his feet Izuku slowly started to float.

'Hmm, so all I have to do is put the energy underneath me and it'll hold me up.' Izuku questioned to himself as he was still figuring out some stuff.

Testing something out Izuku stuck out a finger and a pink energy beam shot out.

All for one saw a pink beam coming at him. Eyes widened, He tried dodging it by jumping into the air, but it hit his leg severing it.

All for one let out a painful scream after having his leg cut off.

Izuku flew towards All For One and watched his leg start to regenerate.

"You should probably end this fight now." The fifth user of One For All said.

"No, not yet. I want to make him suffer a little bit more." Izuku replied as his new powers are warping his mind.

"Where did this power come from? This isn't a quirk from one of the previous users of One For All." All For One said

"You will feel the pain that all of my classmates and friends felt." Izuku replied before pointing a finger at him and firing off a bunch of pink death beams.

All For One kept regenerating his limbs as Izuku kept blasting them off. Eventually he got bored of torturing him. With blinding speed he closed the distance between the two of them and did a roundhouse kick to his head sending him crashing to the ground while also creating a giant crater upon impact.

"Whatever this power is I think it's warping your mind. It'll be best if you end this before something bad happens." The sixth user said.

"I've never felt better, but you're right I should end this. When someone is backed into a corner they become desperate." Izuku replied as he was descending towards the ground.

Izuku landed in front of All For One ready to put him out of his misery. Outstretching his arm, Izuku shot a Ki blast point blank range, killing All For One instantly.

Izuku looked around at the scene. What was once a giant school is just a bunch of dirt and rubble with a giant crater with Izuku in the middle of it. Now that the fight was actually over everything started to settle in.

"No one survived." Izuku said shaking. His pink aura and red eyes came back.

The area started shaking.

"AAAAAHHHHHHHHH!!" Izuku screamed out loud getting out all of his sadness and frustration. With him yelling and his immense power he was able to tear a hole opening up multiple portals. Looking through one he sees a alley.

"Hmm must be a teleporting ability that Buu has." After saying that he goes through the portal. Little did he know he wasn't in his universe anymore.

Supreme Kai world

"you sealed Buu inside of that boy." Supreme Kai said to old Kai.

"Yep he's sealed away forever inside that boy. We don't need to take care of him anymore." Old Kai said

Supreme Kai watched Izuku beat All For One. Then he saw Izuku open up a portal. "Oh no great ancestor you have to see this. The boy you sealed Buu in just entered a different universe."

"What?" Kibito replied

All three of them looking at the crystal ball.

"We have to get him back." Shin said

"There are hundreds of universes out there. And your not strong enough to create a portal to bring him back. The best you can do is talk to him."

(This is not based off of Super)

A/N: Izuku needed a power up or else he would've been cannon fodder after the first arc of Dxd.