The Sugiyama couple have been sexless for a year now, with Shigeru, a landlord, being useless down there. Ayumi, the frustrated wife, indulges in masturbation with a toy she received as a gift. When Osawa, a neighbor who happens to be there to deliver a notice, sees a shocking sight: the extremely vulgar appearance of the elegant and serious-looking wife. Unable to contain his excitement, Osawa attacks Ayumi. Despite being violated, the sensation of a cock, which she hasn't experienced in a long time, brings back Ayumi's true nature...