After his father remarried, the new mother Yumeno moved into the house. While studying late at night, Atsushi would hear the intense sounds of sex between his father and Yumeno leaking from their bedroom every night, causing him to dislike his stepmother. One day, Atsushi forcibly raped Yumeno and took photos with his smartphone. Afterwards, he used the photos to blackmail her into becoming his sex slave, gradually training her. As the pleasure training progressed, Yumeno, possessed by the sensation, offered her mature body to Atsushi's friends as commanded, ultimately falling into being a sex slave.
