U.A. High's Class 1-A has been sent to the remote Nabu Island as part of a safety program. Izuku Midoriya, the holder of One for All, meets Mahoro Shimano, and her brother Katsuma, residents of the island. Bonding with them along with his rival Katsuki Bakugo, they discover that Katsuma wishes to become a hero, but Mahoro seeks to dissuade him, believing his Quirk to be unsuited for that line of work.
Meanwhile, Mahoro and Katsuma's father, who possesses a healing Quirk called Cell Activation, is attacked by Nine and his party. Nine, who has been empowered by All For One, can steal and possess up to nine Quirks, and steals Cell Activation. As his body cannot handle all of his Quirks without suffering damage, he seeks to use the stolen Quirk to heal himself, becoming near-invincible. However, the stolen Quirk is incompatible with his blood type. Nine surmises that the man's children might possess a better variant of it, and pursues them.
Nine and his gang arrive on the island and destroy all the ships and communication towers. Class 1-A learns of the invasion and split up to stop the villains and escort the island residents to safety. Nine finds the children and confirms Katsuma possesses a superior version of Cell Activation, but Midoriya intervenes before he can steal it; however, neither he nor Bakugo are a match against Nine. Despite this, they force him to retreat due to overusing his Quirks.
Class 1-A regroups and decide to attack the villains head-on, while awaiting the arrival of other heroes. Upon evacuating the islanders, the class defeat the rest of Nine's crew, but are incapacitated by Nine, except for Midoriya and Bakugo. Despite using more of their power, the boys are still no match for Nine. Seeing no other way to defeat Nine, Midoriya transfers One For All into Bakugo, while he uses leftover embers of its power. Together, the two overpower and defeat Nine, but Midoriya's One For All seemingly fades away afterwards.
As the military and professional heroes arrive, All Might finds an unconscious Bakugo and Midoriya. He realizes that, somehow, One For All remains within Midoriya, as the transfer into Bakugo was interrupted, and theorizes that the previous wielders of One For All wanted Midoriya to remain as its successor. Elsewhere on the island, Tomura Shigaraki, the leader of the League of Villains, finds and kills the weakened Nine out of spite.
With Nine's gang apprehended, the class spends the rest of their time repairing damage to the island before returning home. Midoriya and Bakugo, who has no memory of being given One For All, say goodbye to Katsuma and Mahoro, as a determined Katsuma promises to enter U.A. in the future.
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