Her father passed away early, and her mother has had to struggle alone to take care of and raise Mirei until today. Mirei knows her mother has sacrificed so much for her, so she hopes her mother can be happy. And when her mother introduced Mirei to the man who will soon become her new father, Mirei felt an extremely strange sensation about this man. Just as her intuition suggested, he was a beast disguised as a human. Taking advantage of her mother's absence, he used violence to suppress and seize Mirei's body. How could a frail schoolgirl escape from the grasp of a man? Mirei could only cry out for help in despair. However, seeing her mother's happy smile, Mirei had no choice but to grit her teeth and endure, accepting to be violated by him day after day, accepting all of his perverse demands...