A female college student lives on the floor above me in my apartment. However, she's a typical nerd girl who dresses plainly. I wasn't particularly interested in her, but manga was the trigger for us to start visiting each other's rooms. It was a miracle that such an old man could become friends with a girl much younger than him, but the surprising situation didn't end there! The plain virgin's true identity is that she is a nymphomaniac who is curious about men's genitalia and masturbates constantly, and on top of that, she has huge breasts like in a manga! We spend our days devouring each other's bodies like crazy.