""Gosurori vanpaia shisuta zu ~in tsu no utage~" is a pretty high - quality 3D hentai work of 2006, released by the Studio "Crystal Core". The action of hentai takes place in our time and tells the story of two beautiful twin sisters, who managed to fall in love with the same guy. Girls every day try to satisfy the sexual needs of a guy who every time become more and more lustful and perverted. This time he asked them to change into Gothic