Nina's big sister has been taken away by the demon lords of the land. Everyone home has accepted the mistreatment out of fear. But Nina is different. Along with her friend Ignis they attempt an infiltration on the demonic manor only to find themselves trapped in a place of nightmares and depravation. As they uncover the secrets of the lords, Nina will begin to question her very nature. Will they survive the night? or will the might of a superior species be too much for them?