With seven days before the raid on the Yakuza base, Izuku had one hell of a deadline to learn how to use All for One and Rewind in a practical matter. 168 hours isn't a lot of time to master two drastically different quirks, not to mention he had to sleep and eat. That number is more like 84 hours with sleep and meals accounted for. Despite this, Izuku's ability to adapt under pressure and learn very quickly is second to only Bakugou, at least for now. He was certain there was something about All for One he was missing, perhaps an ability that had yet to develop that allowed him to learn how to use the quirks as fast as his father was able to use them. Certain quirks came surprisingly naturally to him, he was able to channel some of the emitter quirks like he had used them all his life. As for more technical and advanced quirks such as All for One itself and rewind it took days and perhaps will take months to use in a practical sense. In the short window of time, he had managed to be able to control Eri's quirk, being able to rewind a tall pine tree back to a pine cone. As for All for One, he learned how to take and give quirks rather easily, it's once he had said quirk was the issue, he still had no idea how to force activate someone's quirk or to deactivate it for that matter.

With the night before the raid approaching, Izuku made it a point to visit with Recovery girl to catalog the quirks he has in his arsenal. Her and All Might were present in this with Izuku using a training dummy to show off his quirks. Eri watched curiously from on top of All Might's shoulders as her adoptive father ran through every offensive quirk in his arsenal. Nezu wasn't too pleased about having almost twenty training dummies trashed by the quirk vault. The quirks he stole from the Noumu proved quite destructive, each one destroying the training dummies that were meant to take months of punishment from hero course students. Other quirks he had vaporized them instantly despite them being fireproof. Eri was particularly happy when a dummy with a crow's beak over its face was vaporized by a finger beam from Izuku. All Might was a little concerned about Eri's reaction to that particular dummy being dusted but understood that she would naturally have resentment for Overhaul after what he did to her.

"Aright Midoriya, come back in here we got what we needed from that. Nezu isn't happy about you trashing so many training dummies." Recovery girl says through the intercom causing Izuku to stop and wipe the sweat from his face.

"Sheesh, 18 quirks and every single one of them trashed those things like they were made out of paper mache." All Might says watching his successor come back to the office where Recovery Girl, Eri and himself were watching.

"He has 3 for mobility and 3 for regeneration plus Eri's quirk. He's most definitely unstoppable as is. The extent of the regenerative abilities is astonishing! He can regenerate even when he's body has been incinerated. As long as his brain remains unscathed he can regenerate. It begs the question though, with the noumu we've encountered are their brains an actual weak point or are they invulnerable there?" Nezu asks looking at a picture of the USJ Noumu in the tartarus.

"I for one think that Young Midoriya should take the quirks of that particular Noumu and should be the one to find out if it is vulnerable to a brain shot. That noumu was specifically designed to kill me and almost succeeded had young Todoroki and Bakugou not intervened. It would be best if he dealt with that Noumu before the league decides to try to take it back." All Might of all people surprisingly says, surprising Izuku the most.

"How are we going to convince them to let me take it's quirks?" Izuku asks arching an eyebrow with Nezu pulling out his phone and typing on it for a brief moment.

"Simple. I just bought it." Nezu says showing the transaction for the Noumu under the pretense it is for study purposes.

"Really? As simple as that?!" Recovery Girl exclaims reading the messages between Nezu and the chief of police.

"Yes, there's nothing wrong with purchasing a corpse for autopsy and research." Nezu says in a devilishly cheery tone.

"You say that but I still think this is a bad idea." Izuku says watching on Nezu's phone as the prison guards load the noumu on the back of an armoured transport vehicle.

Within the hour the transport made it to UA, the armed guards dragged the Noumu to the main courtyard. Izuku and Nezu were there to greet them and as soon as they had the Noumu out. From there Nezu nods once and Izuku motions for the guards to move back a few feet, he rears back charging One for All to as high he can go without it hurting. 25%, 37%, 49%, 61%, 73%, 85% he manages before it starts to become too much for his body. He lets loose a single punch that flattens the head of the Noumu in that singular blow. The blow crushes the creature's brain killing it despite the shock absorption and regenerative abilities it possesses. From there Izuku crouches down and digs his fingers into the remaining grey matter of the Noumu and rips the quirks out of the creature. Quirks that were forced onto a person or given persist after death as Izuku had learned from the deceased Noumu in the compound where he was given his All for One powers.

"There, that answers that question. Whenever we are dealing with Noumu attack their brain and destroy it, they won't be able to regenerate. Now you also have another regenerative quirk and shock absorption. I think you are prepared for tomorrow's raid on the Yakuza facility." Nezu says bidding the guards a good day and asking Izuku to deal with what's left of the Nomu's body.

Bakugou was watching from the dorms, he was curious as to what Deku was capable of now that he had All for One. He was still on the fence about Deku having All for One and All Might's power. He was planning on confronting Izuku about it but due to his constant training and Katsuki's own remedial courses he was unable to do so. Had Deku always had this power? Surely he didn't otherwise why would he had said he was quirkless. Maybe those villains that captured him and Deku had turned Deku to their side and he was biding his time to take them down. Bakugou shook his head at the idea, the nerd was too much a teacher's pet and goody two shoes to do anything of the sort. He was certain he didn't even have the moxy to talk back to him let alone become a villain. But he still wondered what they did to him, then a thought crossed his own mind. "What if I took up their offer?" It surprised him at first, then he looked back on what had happened, they were not aggressive or rude to him, they wanted him to their side. What if he had taken up their offer and joined them? Would they have given him that same power or was it just for Deku? He scoffed about the thought again, the useless Deku had somehow gotten All Might's quirk and now the single strongest quirk in existence... "How long till he comes after mine?" He says to himself glaring out the window as Izuku smashes the head of the USJ Noumu in a single blow.

"Holy shit..." Bakugou says out loud getting Kirishima's attention from the common room.

"What's up bro?" he asks looking out the window at what Bakugou is staring at. "Is that the USJ Noumu?! What's it doing here?!" He asks in shock seeing it lie in a heap on the floor.

"Deku just killed it, in one punch." Bakugou answers, causing Kirishima and a few others to now gather at the front of the dorms as they watch Izuku steal the quirks from the Noumu. "Bastard is just getting stronger and stronger with all those damn quirks he's taking."

"He's on our side, Bakugou, he's not our enemy. Sure his dad is the big bad evil guy but Midoriya isn't like him." Kaminari says placing a hand on Bakugou's shoulder.

"That nerd said that his quirk had a drawback of a quirk hunger... how long till he comes after our quirks. When he runs out of villain's quirks to steal he's gonna take ours next." Bakugou grumbles before being smacked across the face by Ochako of all people.

"Deku-kun would never do that Bakugou, you've let your petty hatred for him go too far! He's our friend and you're the only one that thinks he would do that!" Ochako shouts in Izuku's defense.

"He's changed you fat bitch! He spent 2 months in the clutches of those villains. There's no telling what they did to him there! What about that shitty plan of his huh?! He's going to take all the quirks of every hero attempting to capture those shit head villains tomorrow and none of you will be able to stop him. All of you will be quirkless and weak against a new All for One. He claims that he's doing it to defend you all from those quirk erasing drug things. I don't buy it! Stop thinking with your emotions you fool and look at this like a fucking hero!" He shouts, poking his finger into her shoulder. Ochako snaps and flips him over her shoulder through the glass coffee table out of reaction.

"You listen Bakugou! You have no idea what the person Deku-kun is. He risked his life time and time again to help us. Several of us in this room would be dead had it not been for him intervening. Myself, Tsu, Todoroki, Iida, and You among them. So put aside your hatred for the only one out of our class who's already a hero!" She snaps back before storming out of the room angered at what Bakugou had said. Meanwhile he groans on the floor bleeding slightly from the back having been thrown through the glass table. 

"That bitch... Her and her fucking villain boyfriend." Bakugo groans glaring daggers in the direction that Ochako had walked off in.