Following the intense finals at U.A., Deku and All Might are invited to the innovative I-Island, a colossal mobile city dedicated to scientific advancements. Amidst the I-Expo showcasing Quirk technologies, Deku encounters Melissa, a girl without powers, triggering memories of his own Quirkless past. Suddenly, villains breach the island's formidable security, seizing everyone as captives. As chaos ensues, the fate of hero society rests on the shoulders of All Might, the revered Symbol of Peace.