"Yuji," who grew up in a facility and didn't know the warmth of his family, couldn't get used to the warmth of his wife's family. However, only Yukie, my mother-in-law, was kind to me. Yuji witnesses Yukie's masturbation one day. It was only a matter of time before the two who were not satisfied with each other had a lewd relationship. The relationship between the two continued without the family knowing.