A project to help couples suffering from a sexless marriage has begun! The Takahashis have been together since they were students, and naturally became sexless! The plan is to use the client's husband and wife's best friend as a prankster to show the husband and best friend having sex to the wife and stir up Kokoro! The Kawasakis are married to a couple with a large age gap, and the husband is suffering from erectile dysfunction. So they invite a junior colleague from the husband's company to their house and leave him alone with the wife! In a good mood, he cuckolds the frustrated wife, and the husband watches the whole thing, inducing a depressed erection! ? The Satos are the clients! The busty wife seduces the husband, using a friend's couple as a prankster! The husband was supposed to have sex with his horny husband, but the wife also gets a good feeling for the friend's husband, and it develops into an unexpected swapping sex! ?