Toru Muranishi (村西とおる, Muranishi Tōru; born 9 September 1948) is an innovative and controversial director of Japanese adult videos (AV). Known in Japan as the "Emperor of Porn", he has been credited as one of the creators of the quasi-documentary style found in Japanese adult videos, a genre which has remained popular throughout the history of the adult industry in Japan. He was called "the dirtiest of the industry’s dirty old men" in a 1992 Tokyo Journal article by Kjell Fornander.
Source: “Toru Muranishi”, English Wikipedia (CC BY-SA 4.0), excerpt