Captives of Immorality(2006)

Original title: Haitoku no toriko-tachi

A ripened body is not satisfied with just one man… Kanako lives an elegant life as the wife of a company president. However, her husband is more than 20 years older, and she harbors dissatisfaction with their sex life. At that time, she is invited to a home party by Ruriko, her senior from her university days. However, what she sees at Ruriko’s house is a scene that could be taken as humiliating for the chaste Kanako…