Deku and All Might are invited to I-Expo, the world's largest showcase of Quirk abilities and hero item developments! Deku encounters Melissa, a girl who is Quirkless just like him, among the excitement, sponsors, and pros from all around. Suddenly, I-top-of-the-line Expo's security system is hacked by crooks, launching a diabolical scheme. It's a severe threat to hero society, and one man has the key to it all: All Might, the emblem of peace.