Haruna, a female college student, has a huge butt with a diameter of 100 cm, but small breasts. Perhaps because of her miraculous body shape, where female hormones are concentrated too much in her lower body, her whole body quickly becomes stiff. Unable to resist, she requests a mobile massage, and an erotic masseuse turns up...!? Her plump butt and thighs are kneaded and squeezed, and when her pussy is caressed with fingers, she lets out a sweet moan... and they end up having sex! Her vagina is stimulated by a meat stick, and she falls deeper and deeper into the swamp of pleasure...