Miyabi marries a man she met through work and enjoys a happy life with him, but his adult son Yusei refuses to open up to her. Haunted by betrayal from his previous mother figure and deeply distrustful of women, Yusei tries to drive Miyabi away by treating her as a sexual outlet. Desperate to preserve the family bond, she continues obeying him. Then Yusei brings adult classmates home and lets them abuse her without mercy, plunging Miyabi into seemingly endless humiliation. An adult family-role-play drama.