Ema, who had been working in the entertainment industry in Tokyo, suddenly announced her retirement and lived a decadent life at her parents' house in the countryside. One day, she met her stepbrother for the first time in several years, but he was still a virgin and was constantly masturbating. He was so excited by his sister's defenseless, braless appearance that he attacked her and they ended up having sex. Ema also felt good after a long time of sex and climaxed, and they continued to have sex many times after that.