My Hero Academia manga volume 15 features story and art by Kohei Horikoshi.

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…