During the day, when their husbands are at work, the frustrated wives have too much time on their hands. As they get together and enjoy wine as usual, Mizuki says she has bought some new underwear and asks them to take a look, lifting her skirt and revealing her sexy O-back. She then encourages the other wives to buy lingerie that exposes their butts, and suggests that they try to see how many men they can seduce with that erotic underwear...