Sumire has been married to her husband for five years. Her husband no longer sees her as a woman, so she has an affair with Yoichi. Sumire feels guilty for her actions, which can be seen as a betrayal of her husband, but every time she meets Yoichi, her feelings for Yoichi grow stronger. Even though she thinks, ``Today is the day to say goodbye,'' she once again experiences Yoichi's kindness and the pleasure of being treated as a female, and Sumire becomes even more dependent on this relationship...