Yuuko, the wife of Kashiwagi's friend who lives next door, bursts into his apartment where he lives alone. It seems that she got drunk and entered the wrong room, and mistook Kashiwagi for her husband. She yells at him about her daily frustrations with her married life, and, ignoring Kashiwagi's confusion, she forcefully strips him of his pajamas and takes his penis into her mouth... When Yuuko sobers up and realizes what has happened, she hopes to somehow sweep this matter under the rug, but... Kashiwagi can't forget the stimulating incident...