Nightmare x Deathscythe Hangyaku no Resonance - 1

Rinne Natsuma was an ordinary schoolgirl and lived all her life, thinking so until she recognized the secret of her existence. A few months ago, she was attacked by a satanic cult as a result of which she lost her father. At this moment, she arouses in herself the strength "the god of death " and seeks to immediately avenge her offenders. In the end, short -term peace does not last long, and it is trapped.
Akuto, the head of the branch of the Order, turned his grievances to Rinn for the wounds inflicted on him by the Father Rinne. The sacred marriage ritual between the devil and death should begin. And here the wandering exorcists of Setsun Sindow and Yuuk Sindow appear and despite the fact that they desperately resist, they are surrounded by a large number of cultists ... What awaits them outside this hopeless situation?