Okamoto, a top student at an adult art college, falls into a creative slump because his obsession with realism keeps him from producing work he accepts. Instructor Hibiki decides to bare herself for him, insisting that he cannot draw the real thing without experiencing a woman. Their secret lesson begins, and as the sexually inexperienced Okamoto explores her body, Hibiki becomes increasingly absorbed. What starts as an excuse for physical intimacy slowly turns into mutual attraction.