Nozomi lived with her adoptive father, Kanjiro, who was bedridden and required constant care. An abnormal relationship had begun to develop between Nozomi and Kanjiro. One day, Nozomi's stepson, Tsukasa, witnessed the disturbing scene of her intimate caregiving. Knowing of the unstable relationship between Nozomi and his grandfather, Tsukasa began blackmailing her, turning her into an object to satisfy his own desires. This twisted dynamic deepened further, evolving into a triple incest involving grandfather, stepmother, and son.