50-year-old Miyuki has been living alone for several years since her husband passed away, raising her two sons by herself. Seeking to satisfy her own desires, she begins a sexual relationship with her younger son, only to be caught by her reclusive eldest son. Though scolded by him, she finds herself emotionally stirred by his aggressive demeanor, awakening long-dormant feelings as a woman. Soon, she starts moving her hips on her own, moaning passionately as she indulges in forbidden pleasure.