Naho, the head nurse and hospital director's wife, develops intense romantic feelings for her brother-in-law. Her passionate relationship with her husband now feels empty and meaningless. As her brother-in-law prepares to leave home upon passing his exams, her suppressed emotions erupt uncontrollably. She aggressively seduces him, revealing her true aggressive, lustful nature. Her hidden desires grow increasingly depraved, impossible to satisfy even through secret masturbation. Her obsessive longing spirals deeper, consuming her completely.