Neglected by a husband who only cares about work, Yukari spends her days masturbating alone. One day, while she is soothing her unsatisfied body, neighbor Hiroki arrives with a travel souvenir. Worried because she carelessly left the door unlocked, he comes to warn her and instead sees Yukari lost in shameless pleasure. Panicking, she instinctively presses her breasts against him to secure his silence. "If you keep this secret, I'll give you a much deeper kind of neighborly relationship." As her huge tits bounce through rough sex, they quickly go from mere neighbors to lovers.