Alien parasites have invaded Earth and taken over the minds of ordinary people. Shinichi has also been infected with a parasite, but he can still think and act for himself, and that makes him different. Hes already been approached by two mysterious victims of the invasion: Ryoko Tamiya, a schoolteacher, and her former lover, A. While Ryoko may yet be an ally or foe, Shinichi barely escaped As attack with his life intact. Now, theres a new parasite in town, and hes a student in Shinichis school! Just what do these parasites want with humanity and with Shinichi?
