Muranishi Toru 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 AVs, a genre that 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.

After graduating high school, Muranishi moved to Tokyo where he sold encyclopedias, subsequently becoming involved in book publishing and the entertainment industry. Muranishi joined the newly formed AV studio Crystal-Eizou in late 1984 and began directing films with them soon afterward. In September 1988 Muranishi left Crystal-Eizou to form his own company, Diamond Visual, which became Japanese largest production company, raking in 10 billion yen of annual sales. Despite its popularity, Diamond Visual went bankrupt in 1992 with debts of 5 billion yen (about $40 million) and Muranishi had to greatly alter his style of living, going from a luxury home and Rolls-Royce to barely be able to afford an apartment.

He is married to pornstar Nogi Mariko.
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