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Rikako lives with her husband and son Akira. At first glance, they seem like a happy family, but Rikako has a secret she can't tell anyone. It is the existence of a boyfriend, Takashi, who is as old as a parent and child who met on a dating site. Rikako who understands that it is a bad thing but gives herself up to her desires and has a relationship with Takashi many times. One day, he finds out that Takashi is Akira's classmate. Rikako takes this opportunity to break up with Takashi, but their relationship takes an unexpected turn...