Lately, with her husband constantly away on long business trips, Iku finds herself increasingly drawn to her son's mature demeanor and gestures, feeling an intense sexual temptation. As she observes him, fantasies begin to form—ones that go far beyond the boundaries of a mother-son relationship—and her uncontrollable desire grows stronger. One day, Iku discovers her son secretly reading a pornographic magazine. Intrigued by his actions, she ends up masturbating herself. When her son finds out, he confesses that he has been fantasizing about sex, picturing his mother while looking at the images in the magazine. He then forcefully begins to caress her body, initiating an intimate relationship. Unable to resist, Iku gives in to his advances, and they become physically involved. From that day on, the mother and son, exhausted from hiding their desires and fantasies, open up to each other emotionally and fill each day with sex.