Arika who lives with her daughter and her husband. She is currently active as an underwear model influencer on SNS, as well as venting her daily frustration. One day, she happens to know that her son-in-law, Kenichi, is a big dick. Recently, she became unbearable while listening to him worrying that she had not been with her daughter for a long time. She says to herself, "Instead of her daughter...", but her body is always looking for her son-in-law's big cock...