A rookie adventurer is defeated by two succubi sisters � the red-haired elder sister Rerina and the blue-haired younger sister Rim. He is taken to an underground prison where they declare: "Welcome to the Succubus Prison. From today, you'll be our pet... our exclusive livestock, forever milked of your semen." Rerina's glowing red eyes paralyze his body as intense arousal builds, and with their demonic magic they begin endlessly extracting his seed...