The beautiful and successful supermodel Jun Fudou meets a woman named Lan Asuka who confronts her with a werewolf monster which she calls a devil beast. As a result unimagined powers awaken in Jun and she manages to defeat the monster. She just like this werewolf is part of the next step in human evolution: humans who can mutate into beast-like monsters and then mercilessly terrorise civilisation. Unlike the other devil beasts however she can retain her humanity which is her undoing because Lan Asuka is a high-ranking employee of the government and of the “Anti-Beast Special Squad” which wants to abuse her powers and train her to mercilessly hunt down her own species. Caught between these extremes and her weak self the question arises: what fate will Jun meet? Will she ever be able to decide it for herself?