Nightmare x Deathscythe: Hangyaku no Resonance

Rinne Natsume's ordinary life shatters when she discovers her secret: she harbors the power of the "god of death." After defeating a devil cult that attacked her, and killed her father, she is captured. Akuto, the cult's leader, seeks revenge for wounds inflicted by Rinne's father and plans a sacred mating ritual between the devil and the god of death. As the ritual looms, exorcists Setsuna Shindou and Yuuka appear to help. However, they are quickly overwhelmed by the cult's forces. The story follows Rinne's struggle against the cult, the impending ritual, and the desperate fight for survival against overwhelming odds. The anime explores themes of hidden power, revenge, and the battle between good and evil.