Since antiquity, flesh eating monsters who can take human form, known as Shokujinki, have preyed on people. A dedicated group of swordsmen, the Kifuuken, have made it their mission to hunt them. In modern times, the Kifuuken have lost much of their power and influence but the heir apparent, Toshihiko Momota, continues the fight. One day he meets a beautiful woman, Yuka, by chance. Toshihiko can’t help but to love her, even after he finds out Yuka is a flesh eater. The two run away, leaving the Kifuuken in disarray with Shokujinki attacks on the rise.