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The wife who had an affair while being pregnant, and Shitayu who is now having an affair. The "best-before date" of a good couple. The married life with her beloved husband is entering its fourth year. Maybe 鴛田, who wants to have a child soon, too. One day, my best friend told me that she saw her husband walking with another woman. Maybe she believes that her husband cannot have an affair. Fertility,, love triangle relationship? A disturbing feeling that comes to the couple. "best-before date" of a good couple.