Kyoko visits her son Daisuke's room every day, where he is diligently studying for college entrance exams, but instead of helping him focus, she keeps urging him to drink. Daisuke reluctantly goes along, motivated by a desire to ease his mother Kyoko's loneliness in the absence of her husband. Yet his true intention is driven by a hidden desire—to take advantage of his drunken mother and have sex with her. Gradually, a forbidden relationship begins to develop between mother and son, escalating into shocking scenes of them passionately entwining their bodies.