They get along well, but their relationship is more like that of friends... Rie helps her husband, who works in the product development department of an underwear manufacturer, by testing prototypes. Her mature body shows no signs of slowing down and remains attractive, but they haven't had sex in about six months. Then, one day, her husband brings home Kawazu, a subordinate in the development department. Kawazu is embarrassed to see his boss' wife always wearing the underwear he developed as a tester, and Rie's vagina starts to heat up. Unable to hold back, her husband rapes her while she's still in the dark...