The series follows Kōhei Yuzuki, who moves to Tokyo and becomes involved with a group of people who hunt Shokujin, creatures that can transform into various forms. He meets a girl named Shokujin, who is a member of a secret organization that deals with these creatures. As Kōhei becomes more involved with the group, he uncovers a complex web of relationships and conspiracies surrounding the Shokujin.