Chapter 27: The Warcraft of Doom arrives
A flashback of the bachelor party begins as Izu and his male friends bonded with videogames as All Might and the others have beer and laugh as they play pool. Soon, Izuku's grandpa gathered everyone around so All Might can practice his vows and commitment to Inko. After a moment of silence and a story of Inzenko, All Might, Endeavor, Hawks and Best Jeanist discuss about what vows to say to Inko and what commitments to make until Izu shows everyone a home video of him and his parents before Izenko's death. Afterwards, Izuku gets emotional as his friends comforted him while All Might look at a picture of what it seems to be his wife and kids before making a monologue about not making the same mistake again. The flashback then ends with All Might assuring Izu that everything is going to be ok.
At the wedding, the Warcraft of doom makes an appearance as All Might demanded what do they want, which caused All for one to appear and said that they are here for revenge because of the Peanut Gallery's fight with the Devil Brats. Suddenly, Izuku and Inko froze with fear before their friends snapped them back to their senses so they can tell everyone that All for one is the one who killed Izenko, which made everyone gasp. All for one then look at Izu and his mom and smiled sadistically as he told them that Izenko was weak and wasted his time by being a hostage because he's a dummy just like them, causing most everyone to get furious and scolded him for doing an unforgivable crime that caused Izu and Inko sorrow. All for one then just laugh evilly and told the Devil Brats to come forward and said hello to their friends, causing the Devil Brats themselves to jump out and scared the Peanut Gallery. The heroes then try to fight but they all got defeated easily by most of All for one's goons. All for one then gathered the leaders, including Rikkiya's father and Atsuhiro's grandfather so they can finish the job and kill All Might, who is restrained by a nomu much to Izu and Inko's horror as a brief flashback of Izenko appears.
The Devil Brats then gets a flashback of them knowing each other since they were babies. They live together at an abandoned factory as Hatsume's grandparents took him in and raise him themselves. Soon, All for one and Rosalina managed to become the most dangerous villains of Japan and stole enough money to build their headquarters where became leaders of the Warcraft of Doom and gathered more villains to work with in order to take over the world. All for one then tasked the Devil Brats to make themselves known in Japan so they can find the kid that All Might gives one for all to in the kindergarten center. After going on a crime spree, which includes murdering innocent lives, The newfound Devil Brats gets enrolled into kindergarten after watching All Might confirmed his dating status with Inko. The flashback ends with the Devil Brats' training before getting dropped at the kindergarten center as they smile evilly with thunder flashing.