The wife Aihara Kazuko, a web designer, and her husband Aihara Erya, who works in a stationery manufacturing factory, have a very harmonious relationship even though they have a sexless marriage and no children, but the two have a secret - on the night of the third Thursday of every month, TuesdayThey will also spend time with their “lover”. The two of them, who are in their 7th year of marriage, have chosen the “extramarital love permission system”.