Nobody knows where they came from. They parasitize in human beings, take control of them and change their bodies into hideous monsters (Necro-borg). The Necro-borg fight each other until the…

Toru recalls his life in the 1960s, when his friend Kizuki killed himself and he grew close to Naoko, Kizuki’s girlfriend, and another woman, the outgoing, lively Midori.