Mr. Aikawa has been married for three years. - Although she was not blessed with children, she seems to have enjoyed the life of just the two of them. - However, since half a year ago, her husband's appearance has changed suddenly, and it is said that the couple's time has decreased considerably compared to before. - On holidays, my husband and I used to go on trips and shopping together, but it has almost disappeared, and we only have night activities once a month. - One day, she sees her husband talking with his neighbor's wife. - Aikawa-san, who felt uncomfortable with her usually unfriendly husband treating her frankly, instinctively suspects her cheating. - And when she checks on her husband's behavior on a holiday, she witnesses her husband enter a neighbor's house.