Nightmare x Deathscythe -Part 1- Resonance of Rebellion

Story

Rinne Natsume was living, or so she thought, as an utterly ordinary female student... until she learned her own secret. A few months earlier, she was targeted by a demon cult and lost her father. At that moment, she awakened to the power of the 'grim reaper' hidden within her and turned the tables on the cult members. But the momentary peace does not last long, and she is taken captive. Akuta, the cult's branch head, turns his grudge—over the wound Rinne's father inflicted on him—toward Rinne, and now a sacred ritual of union between demon and grim reaper is about to begin. There appear the wandering exorcists Setsuna Shindo and Yuka! But though they fight well, it's in vain as they're surrounded by the many believers... What awaits beyond this desperate, do-or-die situation!?