Soon after her daughter Mei was born, Satsuki divorced her gambling-addicted husband after he buried the family in debt. Determined that being raised by a single mother would never hold Mei back, she worked relentlessly for ten years. Her daughter has now graduated from college, found a job, and is headed toward marriage and a bright future. Then Satsuki unexpectedly sleeps with Mei's adult boyfriend. Despite loving her daughter, she cannot restrain years of pent-up desire, convulsing and arching as electrifying pleasure overwhelms her.