母のもとで暮らす兄と妹。兄は日雇いのアルバイトの日々で妹の生活を支えていた。そんな兄妹は誰にも言えない秘密があった。兄が仕事から帰ってくる時、精神が弱っているときは妹のスカートの中に顔をうずめクンニをしていた。それが習慣化していた。次第に、行為はエスカレートし最終的にはSEXをするようになる。
A brother and sister who live with their mother. His older brother worked part-time as a day laborer to support his younger sister. There was a secret that such brothers and sisters could not tell anyone. When his older brother came home from work and was feeling weak, he buried his face in his younger sister’s skirt and gave her a cunnilingus. It had become a habit. Gradually, the act escalates and finally comes to have sex.