Hiroki is one of several Japanese film directors who got their start in the Japanese softcore pornographic film genre of pink film. He said in an interview that in the late 1970s when he wanted to get into directing, he wrote a script for a pink film and brought it to the Ōkura Eiga studio but they told him he needed to start as an assistant director. At this time he met prolific pink film director Genji Nakamura and during the next three years, Hiroki worked as an assistant director, editor, and manager for Nakamura's company Yū Pro. Hiroki made his first film as a director with Sexual Abuse! Exposed Woman for Million Film in 1982. His debut met with poor reviews and was "terrible" according to Hiroki and he went back to being an assistant director for a time.
Hiroki's next excursion into directing, beginning in November 1983, was more successful, a trio of homoerotic pink films for ENK, a new company with links to Nikkatsu, which specialized in gay pink film. Our Season, Our Generation and Our Moment were frank depictions of the tribulations of gay couples in 1980s Japan. All three films starred veteran pink film actor Tōru Nakane and Our Season, considered the best of the trio by the pink film historians Thomas and Yuko Weisser, had a screenplay by future director Rokurō Mochizuki.
The Weissers dub Hiroki "the prince of youth porn" for his 1984 film produced by Yū Pro and distributed by Nikkatsu, Teacher, Don't Turn Me On!, once again scripted by Rokurō Mochizuki and featuring Tōru Nakane as the college-age tutor of a high-school girl. His most notorious works for Nakamura's Yū Pro were a series of brutal S&M movies directed under the pseudonym Gō Ijūin (伊集院剛), which was also sometimes used by scriptwriter Hitoshi Ishikawa and Nakamura himself. According to Hiroki, using a pseudonym gave him greater freedom to describe S&M relationships in a new way. The Gō Ijūin films directed by Hiroki were the 1984 The SM, distributed by Million Film, The Sexual Abuse from February 1985 and The Sacrifice from February 1986, with the latter two films being released by Nikkatsu.

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