Five years after losing her husband, Mizuki had built a good relationship with a man in her neighborhood. Preparing for remarriage, she was looking forward to starting a new family life. Her son, Manabu, and her partner's son were classmates, and her hopes for the future were high. However, everything changed when Manabu secretly watched Mizuki masturbating. Unable to contain himself, Manabu overpowered her and began asserting control over his mother. Treating her like a dog, he started training and dominating her. Her dream of a new family slowly crumbled as their relationship descended into hell.