All Might gets a real emotional core here, not just the symbol, watching him actually be vulnerable around Deku rewires what you thought you knew about their relationship. The action sequences have weight that the TV show sometimes rushes through, and Melissa's introduction feels earned instead of forced. The plot is predictable from frame one, but the movie knows what it is: a victory lap for people who've already bought in, where character moments matter more than surprises.

Deku and All Might travel to I-Island, a huge artificial city that moves and draws scientists from across the globe, for I-Expo, an exhibition of the newest Quirk research and hero gear. There Deku meets Melissa, the daughter of All Might's old sidekick David Shield, and learns that she was born Quirkless, just as he was. He is also surprised to find many of his Class 1-A classmates at the event. The visit turns dangerous when villains hack the island's security, disable the pro heroes, All Might among them, and take the people on the island hostage, David included. With the adults unable to act, Deku, Melissa and his classmates must face the intruders and uncover a scheme that could shake hero society. The film mixes action and comedy with drama.