One day, Hideki accidentally witnesses his mother masturbating, and he is deeply shaken by the sight. Every time he imagines touching his beloved mother's soft, drooping breasts, an uncontrollable desire wells up inside him. That night, his younger brother also catches a close-up view of the two together, sparking intense jealousy and possessiveness within him, further deepening his feelings toward his mother's body. A poignant story filled with emotional turmoil, depicting the shocking tensions and inner conflicts arising from family bonds.