Deku and his fellow Class 1-A members from UA High's hero course venture to Nabu Island for a safety program meant to sharpen their heroic skills. Sadly, their quest to aid the island's residents gets disrupted when a ruthless villain named Nine invades. Nine wants a unique "quirk" to fuel his evil plan of creating a society that honors only the mightiest quirks. As a result, Class 1-A must safeguard the people from Nine and his barbaric followers to guarantee their survival. While devising a strategy, Deku and his comrades' priorities shift once they realize that their new friend, Katsuma Shimano, requires special protection. The team must now safeguard Katsuma at all costs while battling Nine's destructive attack. But with the odds against them and their prospects of success meager, can Deku and his allies triumph over this perilous predicament?