Sasamoto Sawa is a happily married housewife of 5 years, who works part-time as a cashier at a supermarket. Takigawa Rikako is also a housewife who had recently moved into the neighborhood. Rikako is the wife of the editor of a huge publishing company, and together with their 2 daughters, they live in a newly constructed home. Even though they seemed like a nice happy family, Rikako is actually having affairs in the afternoon, while her husband is at work and her kids are at school.
One day, Rikako is with one of her numerous lovers, a young man by the name of Hagiwara Tomoya, but while in the supermarket's carpark, a high school student, Kentaro, tries to rob them. The police shows up and Rikako needs to cover up the fact that she was having an illicit rendezvous with Tomoya. Spying Sawa leaving the supermarket for home, Rikako quickly pulls Sawa to her side and claims that she was actually at the supermarket with Tomoya to meet up with Sawa, as the three of them had pre-arranged to have coffee together. Sensing Rikako's desperation, Sawa decided to fall in with the act, and backs up Rikako's story. While sorting out the case with the police, Kentaro's form teacher, Kitano Yuichi, shows up to bail his student out. After this chance meeting with Kentaro, Sawa finds herself unable to forget Yuichi, and soon, the two of them become lovers...