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.
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.
All Might and Deku accept an invitation to visit a floating man-made city called I Island where they meet a girl and battle against a villain who takes the island hostage.