Airi, who lives in a housing complex with her husband, one day witnesses her husband's affair. A married woman who lives in the same housing complex next to her husband ... Yes, her husband had an affair with another married woman. Even though I consulted with the other party's husband, Tanaka, I could not believe it and decided to look into the moment of cheating together. The two who witnessed the decisive moment and were hurt shorten the distance to make up for the loneliness. The two who have been taken down by their life companions start running into an affair that seeks each other from an unfulfilled heart.