Nanako is forced to live with her father-in-law Genzo, after being brought along by her busy husband. With her husband constantly preoccupied by work, Nanako grows increasingly dissatisfied. In contrast, Genzo treats her with kindness and warmth. As her time with her husband diminishes, her bond with her father-in-law deepens, and she begins to feel the comfort and peace of a true marital relationship. One night, overwhelmed by loneliness as her husband falls asleep early again, Nanako quietly makes her way to Genzo's bedroom, presses her body against his sleeping form, and confesses the awakening of new, forbidden emotions.