As their son Tatsumi grew up, Ayano and her husband gradually became sexless, and Ayano's sexual frustration only grew. Then she discovered her husband was cheating on her. She couldn't forgive her husband for not paying attention to her and instead satisfying his sexual desires with other women, but she thought about Tatsumi and didn't divorce him. However, when Tatsumi became a university student and started living alone, she found it too much to handle life as a married couple, so she began living separately with divorce in mind. Ayano was meeting Tatsumi at the station to tell him about her divorce.