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A married woman who ran into an affair because of her husband's affair. Her husband is the owner of a beauty salon, and he is said to be in contact with many female customers. Mr. Shinomiya seemed to be worried that his husband would cheat on him with a female customer or staff member even before he got married, but in the end he spent his days without cheating on him. However, one day while cleaning his room, he finds an unused toothbrush. And the name of the love hotel was engraved on the wrapping paper of the toothbrush...