A young girl named Eri becomes a source of concern for Izuku "Deku" Midoriya when his hero internship brings him into contact with Kai Chisaki's crime syndicate. Chisaki's hostility toward the mysterious child leaves Deku fearing for her safety. Together with his upperclassman Mirio Toogata, he must work to stop the villain.
Deku secured the internship after passing his Provisional Hero License exam. On All Might's recommendation, he joined the agency of Sir Nighteye, his mentor's former sidekick and now a renowned hero himself. While Deku's classmates develop their abilities through internships of their own, Chisaki—known as Overhaul—uses his fearsome powers to gain standing in the criminal underworld. His ambitions also bring him into conflict with Tomura Shigaraki and the League of Villains.