In a Japan in ruins, abandoned for more than two centuries, Leon and his group of elite soldiers must recover a mysterious weapon, with such destructive potential that the world preferred to crush the Japanese archipelago under a rain of bombs rather than see its development completed. However, the landing fails and Leon finds himself alone in Tokyo Bay. Hungry, at the end of his strength and with only an anti-radiation suit to protect himself, he soon discovers that the city is not deserted as expected...