Mao Kurata takes up drawing as a new hobby and begins attending a sketch class, only to suddenly be required to draw a fully nude man. Though embarrassed, she can't help but look. During her second lesson, she becomes the model herself and is gradually undressed. Slowly, being watched begins to feel pleasurable, and she becomes aroused. Finally stripped completely naked, she is surrounded by the teacher and fellow students, her big tits fondled and toyed with, escalating into an orgy.