Sachiko, a married woman, cares for her husband who became paralyzed after an accident. Her son, Kenji, worries about her well-being but gradually begins to view his mother in a sexual light after a certain incident. Mari returns home exhausted after her husband's memorial service and falls asleep, captivating her son with her appearance. A sexually aggressive mother who nightly tempts her husband, one morning she notices her son's erect cock, swallows hard, and can no longer resist her desires. Between mother and son, complex emotions and raw lust spiral out of control.