An adult college art-club member has only ever seen his girlfriend Megumi naked. When glamorous model Maki begins weekly nude-drawing sessions, her mature beauty instantly unsettles him. During class she repeatedly smiles only at him. Behind the mysterious model's elegance is an exhibitionist seductress who loves inexperienced men. One night she summons him to the art room for a “private sketch,” spreads her wet pussy in front of him, kisses him without warning, and teases his erection. Overwhelmed by her naked body and seductive presence, he can no longer restrain himself.