Hideki Araki directs, designs the characters, and storyboards this first animated adaptation of POISON's PC game, with original art by Minamoto and a script by Sankichi and Asuna Yu. At a quiet hot-spring inn run by Kyoji Nimura, the wealthy Hidaka family arrives from Tokyo. Their mother, the voluptuous socialite Arisa, is forced onto a sofa and exposed; although she fiercely resists, fingering makes her drip until she gives in, unaware that everything is being recorded. Alongside her are Manatsu, a busty, big-ass tanned adult daughter with extreme sensitivity, and Toka, a bratty adult daughter who toys with her elders. The recorded assault becomes the opening move in a plan to corrupt the Hidaka mother and her adult daughters and draw them into cheating sex.