A thing of the quiet heart of a mountain and a certain private home providing meals and lodging, mother were not in, and, to son, Toshiyuki of father and two, young longed-for aunt, Eriko came over. He peeps into a figure of Eriko raped by father in the evening. He who suffers mental anguish vents a feeling on Eriko not knowing what to do. A lesson for him to become an adult. Forbidden relations are going to begin.