"Would you be willing to be a nude model for a drawing session?" One day, a voice is heard from an art class at a boys' school. It seems that the model for the drawing session was suddenly unable to come, and they are asking the new female art teacher for help. "For the sake of the students," she says shyly, but as she takes off her clothes, a vivid female body is revealed... The boys' school students are Kokoro. Today's lesson is about shunga. We will teach you how to draw shunga, which depicts sexual customs from the Edo period, in a "practical" lesson.