While her husband was away on a business trip, she had an affair. Her father-in-law found out and turned her into a toy, a promiscuous married woman. (by Aika Nai, MXGS-1043)

Because her husband is away on a business trip, the wife, Yui Kana, who has to stay home to take care of her father-in-law, feels lonely and sexually frustrated, so she has an affair with her colleague! Her father-in-law, who was asked by his son to keep an eye on his wife, discovers this and comes to have sex with his daughter-in-law!