Natsume Rinne, a very ordinary schoolgirl, lived her life thinking she was a .......
Until she learned her secret.
A few months ago, she was attacked by a devil cult and lost her father.
At that time, she awakens the power of the "Shinigami" (God of Death) she had been harboring inside her, and defeats the cultists. Akuto, the head of the cult's branch, turns the brunt of his resentment toward Rinne for the wounds inflicted on him by Rinne's father,
Now, the sacred mating ritual between the devil and the god of death is about to begin.
Then, wandering exorcists Setsuna Shindo and Yuka appear! What is waiting for them at the end of this desperate situation?