Mr. F, who obtained information on adult toy purchasers on a certain famous mail order site, targets married women living in the neighborhood and sends out invitations for free trial massages... By narrowing down the target to frustrated wives, the probability of falling into the trap increases dramatically. "Sensei... I can't hold it in..." As the fingers of Mr. F, the self-proclaimed masseuse, crawl over their bodies, the lustful wives tremble and urinate with their vaginal fluids...