Three adult male student role-players are infatuated with Hibiki, the cute and sexy 39-year-old married coworker from their part-time job. On a long-awaited overnight hot-spring trip, alcohol loosens her up as the three admirers surround her with pent-up desire. They masturbate and cum after seeing her naked, one wins her over with a sincere confession and fucks her on the veranda, she gently gives a virgin his first sexual experience, and after more drinks she joins all three in a wild foursome orgy.