Hideaki and Harura got married two years ago. The shy girl was once bullied. A month ago, she happened to meet Motohashi, a man who knew about her past. He threatened to reveal the unwanted sexual acts she was forced to perform back then, and forced her into a "physical relationship" again. To protect her happy life, Harura agreed to an affair with the man. Although she feels sorry for her husband, her body reacts to the lewd stimulation. This is the story of a wife's NTR day.