What would the world be like if 80 percent of the population manifested superpowers called "Quirks"? Heroes and villains would be battling it out everywhere! Being a hero would mean learning to use your power, but where would you go to study? The Hero Academy of course! But what would you do if you were one of the 20 percent who were born Quirkless?

A new and sinister enemy appears in the form of Chisaki Kai, the young leader of the Hassaikai yakuza gang. Looking to fill the power vacuum left by All For One, Chisaki makes contact with the League of Villains to gain possible support. When a chance run-in with a scared little girl brings Midoriya and his mentor Mirio face-to-face with Chisaki, none of them have any idea how much their lives are about to change...