Chô-hentai: Nyotai niku jikken

Art student Saki is assigned to teach painting to former university professor Onuma. Onuma's household is infiltrated by his second wife, Hisako, a former life insurance saleswoman with a criminal record for insurance fraud. Of course, Hisako's goal is Onuma's fortune. His servant, Sanae, brazenly drags men into the barn in broad daylight for affairs. And Maria, his painting model, is egged on by Hisako to provoke Onuma. Only Yoko, his daughter from his first marriage, seems to be the only normal one…