When Kyoka gave birth to her son, her husband developed erectile dysfunction, and Kyoka raised her child while feeling sexually frustrated. Although Kyoka has a stronger sexual desire than most, she was left unattended for a long time, and her desires eventually ran wild. When her son's penis grew to adult size, they finally entered into a forbidden relationship. Kyoka began to desire her son from morning until night, as if to release her long-held frustration, but her son, who inherited Kyoka's lustful bloodline, also had an extraordinary sexual appetite.