While a furious storm rages, three young men materialize in Tokyo in 2007: friendly, blond Ryo; aloof, serious Koji; and irrepressible, offbeat Gawl. They've been sent from the future to prevent genetic biologist Takuma Nakasa from making the discoveries that will lead to the creation of metamorphic humanoid 'Generators'. Posing as students at the prestigious Oju Academy, the trio take a room in the home of abrasive fellow student Masami. Ryo and Koji try to maintain low profiles, but Gawl invariably sticks out like the proverbial sore thumb. Masami discover the secrets of the attractive but reclusive new students. She mistakenly identifies Gawl as a local stalker but continues to pick on him, even after she's proven wrong. Someone from the future has already staked out the Academy and is protecting Nakasa with Generators, human-seeming creatures who transform into bizarre monsters. Gawl, who is also a Generator, must destroy these monsters and hide the fights and their after effects from Masami's prying eyes.