Father died in a traffic accident, Yuzuhira's mother decided to take another step with the desire to have someone as a pillar in the family, always loving and caring for the two. However, life is not as rosy as that. Yuzuhira's stepfather is a patriarchal person, always looking down on women and often getting angry, ordering her mother not only to do household chores but also to work outside to earn money to support him. Yuzuhira's mother's calculations ultimately did not work out as desired, and were even exploited. However, that is not all, he is also extremely perverse, often spying on Yuzuhira while she is bathing. Once while she was masturbating, he suddenly forced himself on her stepdaughter to have sexual relations with him and then threatened her not to disclose this. At first, Yuzuhira was very scared and disgusted, but after being raped for the second time while watching TV, her mood changed completely, instead of fear, she felt a sense of pleasure, novelty when she was first made love to. That way, every day she is drawn into an illicit, incestuous affair with her stepfather.