The neighborhood student, Toshio, is taught by the married woman, Eriko, who helps him with his studies. One day, upon learning that Toshio is not immune to women, Eriko, who has been subtly distant from her husband lately, is swept up by Toshio's curiosity and decides to teach him about women. Unable to resist the pleasure of coloring the innocent younger virgin in her own hue, Eriko increasingly falls into deeper entanglements. However, her jealous husband, Yasunori, notices her changes and secretly sets up a camera. Unaware of this, Eriko continues to bring Toshio into her home under the guise of studying...
