A devoted mother, Yuu, strictly pushes her son to excel in his studies as his exams approach. One day, she discovers adult videos in his room and erupts in anger: "I don't want you watching such vulgar things!" But her son defiantly fires back, insisting he isn't just her tool. Enraged by his defiance, Yuu confronts him head-on—only to be overwhelmed when her son, driven by long-suppressed desire for her mature body, suddenly attacks. The strict mother never anticipated this rebellion, and she is overpowered as a forbidden relationship begins. Crushed beneath her son's relentless lust, the once-clear hierarchy between mother and son completely inverts. This film depicts the taboo romance between mother and child, unraveling the deep shock and whirlpool of desire that follows.