Chapter 149: Enter Dr. Gadget
The beam hits Deku and turn him into a fifteen-year-old teenager before the machine exploded. Deku then get up when Uravity ask if he's ok before revealing himself to his friends before becoming shocked that his friends since kindergarten became fifteen-year-old teens just like him, the older kids are twenty, Shenji is twelves, and the other siblings are either fourteen or sixteen. The Warcraft of Doom then smirked before Himiko taunts them before saying that becoming fifteen-year-old teens is what they get for messing with the organization since their first fight in kindergarten, causing girls to start panicking about their sudden change, while Pinky, Froppy, Mystery, and the boys admired their ripped bodies before smiling mischievously at the villains. Deku then admired the girls' change before giving them compliments for hitting puberty, which caused the Warcraft of Doom to get the kids' attention before Tomura reminded them that they were in a middle of an all-out brawl before the kids' prepared to resume their fight until Deku noticed his monsters and ask why they didn't age up. After Ultradog told Deku that monsters are immortal beings, everyone heard footsteps coming from the stairs.
Dr. Gadget entered the room and looks at the destroyed age controller machine before looking at his comrades, who then points at the U.A. League Jr., causing Dr. Gadget to assume that they got what they deserve for trying to take down their organization. Deku then glared at Gadget before telling him to surrender and say that he'll pay for trying to break up what he had with his friends, causing Dr. Gadget to laughs before asking if Deku really think his team will be together forever. The teens then look at hi as Dr. Gadget as he lectured Deku about how friends come and go as they get older, and the next thing they knew is that they will be going separate ways to focus on their careers. After the lecture, the teens look at each other and smugly told Dr. Gadget that the phrase "friends come and go" is only for civilians who doesn't have the same goal in life before saying that their camaraderie will never break because of both their friendship and desire to be heroes, causing Gadget to become annoyed just in time as the U.A. League Sr. came to help the kids fight the villains.
Gadget's comrades were about to start fighting until he stops them before saying that it's time to tell the heroes why his grandpa wants to steal one for all and take over the world so bad, causing a flashback to begin before All for one and Rosalina got married, have a daughter, and took their grandson and his friends in. Rosalina and All for one talk about their goal in life, which caused All for one to reveal that he wants to be known as the greatest villain, since no one will accept him even though he got the forbidden quirk, he's going to destroy the image of heroes and take over society with his own rules and kingdom. He then wrapped his speech up by saying that he was mistreated, even before he got the forbidden quirk and no hero will help him, so he's going to retaliate by using all for one to make everyone fear him and see him as a king of demons, causing Rosalina to tell All for one that she will be right by his side through it all. Soon, All for one makes himself known to the world as he manipulates people to get what he wants until he heard about the most powerful legendary quirk of all time, which is one for all. They said that whoever possessed one for all will be like a god who's impossible to defeat, which caused All for one to get an evil idea before making it his goal to steal one for all. and use it to take over the world along with the forbidden quirk as he and Rosalina began grooming the Devil Brats. After years of searching for the legendary one for all, All for one heard that his brother Yoichi have taken it to protect it from his corruption, which caused a big fight between All for one and Yoichi until Yoichi was on a brink of death until two rebels chased All for one away before helping Yoichi up. One for all then passed down to Fyet before Yoichi's death until Fyet passed it to Fajin. Soon, one for all was passed down to the rest of the users until All Might gives it to Deku before he starts his first day of kindergarten. Afterwards, All for one gets furious and vowed to steal it no matter what it takes, because after his long rampage looking for All Might and one for all, and killing Izenko on tv, the only person who still have one for all is Deku himself because he might be the last user of one for all. After the flashback, Gadget told Deku that all for one went overboard with his obsession to steal one for all, that's why now that the Devil Brats are the new leaders of the organization, they going to do things differently with patience, clever manipulation, and lots of critically foolproof backup plans, causing the heroes to glare at Gadget as Deku told him that he may change things around here but he'll still won't have one for all, which caused Dr. Gadget to give the heroes a cold death glare before snapping his fingers, so an army of goons can help him and his comrades fight the heroes. The heroes themselves then prepare for a fight as Dr. Gadget told Deku that he should've just come alone and agree to let the organization help him, but now they are going to have to steal one for all by force. Gadget then ask everybody if they're ready for round 2, causing everyone to say that they are ready.