Airi lives a modest life in a housing complex with her husband, a doctor, but one day she catches him cheating. Beside her husband is another married woman living in the same complex... yes, her husband was having a double affair with another housewife. She tries to consult the other woman's husband, Tanaka, but he doesn't believe her, so the two of them decide to spy on the cheating moment together. After witnessing the decisive moment and getting hurt, the two grow closer to fill their loneliness. Having had their life partners stolen, they run into an affair, seeking each other out from their unfulfilled hearts...
