Yama Rikudo is not your ordinary teenage girl; she boasts a unique duo horn-like tufted hair that sets her apart as a demon policewoman. Her crucial mission is to safeguard Japan from runaway demonic monsters. Even when her demon superiors try to remove her from the job due to intense demon-human relationships, she remains strong-willed and fights with her colossal scythe. Disguised as a high schooler, she has developed an affection for Sho Kurogane, a fellow student. However, the school's Headmistress is perpetually searching for eternal youth while sucking souls, plotting evil schemes which put Sho and his friends in peril. Yama must save Sho and his friends from the Headmistress's clutches.