Isourou Tengoku / Paradise Life

Hentai is based on the manga of the same name by Aranaga Hikaru.

Masahiko was forced to go abroad away from his home, because a depraved aunt and her three equally depraved daughters settled in his house. Day and night they used him as a sex toy and the guy's psyche simply couldn't take it, and he ran away. However, the depraved aunt decided to find someone to replace Masahiko. After a short search, an almost ideal option was found - it turned out to be Shinji-kun, an ordinary simple guy with a difficult past. All the girls immediately got used to the new "Masahiko", except the youngest of the sisters, Rika. Will Shinji-kun be able to get out of this difficult situation and find a common language with the stubborn Rika?