A superhero-admiring boy enrolls in a prestigious hero academy and learns what it really means to be a hero, after the strongest superhero grants him his own powers.

When a cult of terrorists ruins a city by releasing a toxin that causes people's abilities to spiral out of control, Japan's greatest heroes spread around the world in an attempt to track down the mastermind and put him to justice.

A group of youths aspiring to become professional superheroes, fight in a world full of people with abilities, also known as quirks. Deku and his fellow classmates from Hero Academy face Nine, the strongest villain yet.