After losing her beloved husband, Reiko lives with her two sons, fulfilling her duties as a mother while raising them. As the boys reach adolescence, their growing sexual curiosity turns toward their mother's body. The older and younger brothers share their feelings with each other, and Reiko gently accepts them. However, their relationship soon transcends simple maternal affection, evolving into deeper, more intense emotions. Entangled in desire and emotional manipulation, an unexpected turn of events awaits...