SLEEPLESS Nocturne

Tomoki Kawai and Yukino Komori are a couple of students who have recently started dating. They went on a date, deciding to take a drive to unfamiliar places. However, their trip was interrupted by misfortune: a flat tire forced the lovers to abandon their car and go in search of help. Fate led them to the doorstep of the Black Rose mansion.

Succumbing to the witchcraft of the estate's owner, Mamie Marie, the young people cross the threshold of the house, where they are immediately stunned by the splendor and luxury of the decor. Four people live within these walls: the maid Aira, the beautiful daughter of the owner Maria, and another girl (?) named Takamizawa Rui. The latter stands out in particular: she is dressed in a provocative variation of a maid's costume, complete with a collar, large cat ears, and even a tail, and she introduces herself as none other than “Takamizawa Rui-nyan!”.

Tomoki and Yukino are preparing to spend a few days in this secluded western estate. They have no idea that they will become prey at the monstrous feast that is about to begin.