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 (), 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.