Reiko works hard as a nurse, but one patient persistently begs her to help him ejaculate. She ends up taking care of her ex-husband's child when he comes to Tokyo, but a series of coincidences lead to her son witnessing her lewd affair with the patient, which has escalated. Her son's desire is aroused, and she is violated by him, and Reiko's womanly nature sinks into the depths of lust that she cannot resist...