GVH-189 Wife presenting circle, Mizuki Yayoi and Aya Mamiya in an exhibition group

A construction site supervisor named Ryo married a younger coworker, Mizuki, a year ago, and they live modestly but happily, though she has little interest in sex. A man named Nakada invites Ryo to a meeting called the Wife Presenting Circle, where members offer their wives to each other. Nakada presses Ryo to give up his wife in return.