Several years have passed since the Walpurgis Night incident, and several bizarre serial murder cases have occurred in the metropolitan area. The bodies of couples are discovered murdered during sexual intercourse. The women had no external injuries, but the men were completely burned and carbonized, except for one part... their genitals. To solve these bizarre incidents, a special detective team called "Tokken" is deployed. Included amongst the members of Tokken is Imari, who experienced the events of Walpurgis Night. While investigating the incident, they found a mysterious phrase, "Spear of Longinus," and a strange cult group related to the incidents.