In a world where 80% of the population has superpowers called "Quirks," heroes and villains are fighting everywhere! Training to become a hero means you have to learn how to use your power. But where do you go to study?

Of course, at the Hero Academy! But what if you are among the 20% who were born without a Quirk? Midoriya has learned some tricks from Gran Torino, but some things you have to experience yourself to truly understand. Even if he's not ready, when the League of Villains attacks the city of Hosu, Midoriya rushes to help Ida, who is in a life-or-death battle with the Hero Killer Stain. Stain has very specific ideas about heroes and their place in society—and he intends to eliminate every hero he can find!