Rinne, a descendant of a death god, is kidnapped and taken to a remote island controlled by a sinister demonic cult. The cult leader subjects her to a brutal ritual designed to use her unique bloodline to conceive a powerful demon child. Despite a rescue attempt by the Shindou sisters and the presence of her boyfriend Touma, the ritual reaches its climax, resulting in the birth of the demon child and granting the cult newfound magical strength.
The Shindou sisters, wandering exorcists, are captured by a demonic cult intent on harnessing the power of the death gods. While Yuuka is subjected to sadistic rituals and corrupted by the cult's influence, Rinne's latent powers finally awaken. Unleashing a devastating attack, Rinne destroys the cult branch and rescues her sisters, though they realize this is only the beginning of their struggle against a nationwide network of evil.