A few months have passed since Yui, a subordinate at his company, married his son Takenori. Kaoru has quit her job to become a full-time housewife and is living a happy life. Kaoru is especially grateful to his wife Yui, who helps with the housework while working. One day, Kaoru falls ill from fatigue. Yui Yui him back to health, but as she watches his defenseless state, a forbidden "emotion" wells up inside her. Yui gently kisses Kaoru's lips...