Yayoi, frustrated by her husband who always claims to be busy and won't satisfy her at night, has been resorting to masturbation. Her son, noticing his mother's unfulfilled desires, has also been suppressing his own urges. One day, while cleaning, Yayoi falls. As her son tends to her, he can't control his lust for her alluring body and ends up raping her. Despite her resistance, Yayoi finds herself enjoying it. From that day forward, she becomes trapped in an abnormal sexual relationship...
