Secret Sex Room

Hikaru has a problem that only his longtime friend can solve. Newly single, he confides in Shinori about how hard bachelor life has been since he was dumped, leaving his body pent-up from a lack of exercise. Shinori, stuck in a sexless marriage after having her daughter, jokingly offers to help ease his tension—and Hikaru joyfully accepts.

To discharge all that thick energy, Shinori starts a secret club where they can "exercise" whenever they can. But their time together isn't enough, so she introduces other high-spirited women to the arrangement: a neglected housewife longing for fulfillment, a busty doctor looking to breed, an elegant debutante wanting to be degraded, and a sporty childhood friend whose toned body can keep going for hours. Together, they push Hikaru's stamina to its limits.