Kemonozume (2006)

Kemonozume "Beast Claw" is an anime series written and directed by Masaaki Yuasa, animated by Studio Madhouse. Since ancient times a race of flesh eating monsters called shokujinki that can assume human form have lived among us. The Kifuken a martial arts school and quasi security force, hunt down these creatures. The main story revolves around a forbidden romance between Toshihiko, the heir to the Kifuken school, Yuka, a young woman who is a shokujinki, and a plot to destroy both of them.