Ruri works at an idol cafe, enduring daily sexual harassment from regular customers. One day, a customer suddenly questions whether Ruri is really a girl. As she tries to deny it, he proposes a shocking game—she'll be considered safe only if her groin shows no typical male reaction when stimulated. However, if white fluid is released, she must perform a special service. With no way to refuse, she agrees. Despite knowing the outcome beforehand, she quickly cums inside her panties when vibrated with an electric massager. The special service begins—using the cafe's private booth seats, she's taken in a threesome, climaxing repeatedly. Later, moving to another location, she's thoroughly dominated by two men, her clit and ass stimulated with various sex toys. Finally, a massage gun is shoved into her ass, triggering endless convulsions as she orgasms over and over.