Natsume Rinne lived like a normal schoolgirl. Until she finds out her secret... She lost her father a few months ago when she was attacked by a demonic cult. At that moment, she awakens to the power of the Shinigami she holds within her and takes revenge on her cult members. She soon finds that her moment of peace does not last long and she is trapped. Akuta, the leader of the cult branch, points the finger of resentment at Rinne, who was hurt by Rinne's father, Now, the ritual of sacred mating between the devil and the Shinigami was about to begin. Just then, wandering exorcists Shindo Setsuna and Yuuka appear! However, despite his good fight, he was surrounded by a large number of believers in vain. What awaits beyond this desperate situation!?