The story revolves around Mahiro Fuwa, a teenager whose sister was mysteriously murdered one year before, and his friend Yoshino Takigawa. Mahiro is contacted by Hakaze Kusaribe, the leader of the Kusaribe clan who was left stranded on an unknown deserted island by her followers, and agrees to help Hakaze in exchange for her help to find out the culprit for the death of his family.

In a world where being born with superpowers called a “Quirk” is the norm, a quirkless regular middle schooler Izuku Midoriya dreams to join the band of heroes that he grew to admire and love, and save the world. Despite being constantly bullied by his schoolmates for having no quirks, he does not give up on his dream and turns his attention into meticulous data gathering about the heroes instead.