Kou, a boy, visits Hakone to cure a special illness. He arrives at a remote clinic. Despite the spacious clinic with a swimming pool and other facilities, a female doctor lives there alone. Her name is Babel. The female doctor diagnoses that Kou's treatment requires contact with the seductive opposite s3x. This is the story of a daily medical examination between an innocent boy and a bewitching female doctor, which can never be told to others.