During a routine investigation by the Narumi Detective Agency, Shohei and his teenaged apprentice Raidou Kuzunoha respond to a call for help from a client. When the client reveals herself to be Kaya Daidôji, she requests them to kill her. The two are baffled but before they can ask why, mysterious men wearing red armored suits and capes kidnap Kaya while they attack Raido to halt his pursuit.

Raidô investigates the Daidôji manor for clues before learning he must rescue Rin, a close friend of Kaya Daidôji. Raidou traverses into the Dark Realm and battles for the return of Rin. Once Rin is rescued she in turn relinquishes information about a curse within the Daidôji family. This curse causes spiritual possession that effects only females near their sixteenth birthday.