Kou-Chan and Aya are childhood friends. One day, Kou-Chan gets a new job as the school doctor, at the school where Aya attends. Now Kou-Chan is at Aya's disposal at all times, and Aya looks for a new excuse every time to go to the new school doctor for a "special" checkup. Kou-Chan tries to resist, but Aya's temptation is too high to resist...