A composed and elegant mother, Kiriko Nio, hides deep-seated desires and passion beneath her modest appearance. She is raped by a doctor and becomes intimately involved with her son, her uncontrollable lust ignited until she ultimately trembles and reaches climax. Within the forbidden theme of mother-son incest, her inner turmoil and shifting emotions are vividly portrayed. Her struggle between adult desire and moral boundaries resonates deeply with viewers.