Mayumi Sato has been married for 13 years to Hideaki. They have one daughter who attends a private middle school. She has a hard time managing the family's budget due to her daughter's tuition fee and other expenses. She then makes the decision to work again for the first time in many years. Hideaki doesn't take the family's tight budget as seriously and he is uncooperative about doing housework. Mayumi is not happy with Hideaki's attitude. Around this time, Taro Nasuda and his wife Ayako visits a model house by a housing company where Hideaki works. Hideaki becomes attracted to Ayako.