Mitsuko and Yoshie's relationship has already spanned 25 years, and their bond remains deeply warm and strong. Their connection began when Mitsuko visited Yoshie's lingerie shop, instantly sparking an intimate emotional bond. While Yoshie initially took the lead in the relationship, Mitsuko has increasingly become the dominant partner over time. Yoshie remains unmarried, while Mitsuko is in a friendship marriage with a gay man who fully approves of her relationship with Yoshie. Since her husband works as an international airline pilot and is often away from home, Yoshie visits Mitsuko's house once a week—a cherished routine. This is the story of one such day.