[2] When Nikkatsu made its decision to concentrate almost exclusively on its Roman porno version of the soft-core pink film genre, Ohara was not enthusiastic about the change.
He worked as chief assistant director to Shōgorō Nishimura on the first Roman porno, Apartment Wife: Afternoon Affair (1971), and made his directorial debut the following year with the successful period film, Passion: Ohichi's Love Song (1972).
[3][4] Summarizing his style, the Weissers say, "Director Ohara is one of Nikkatsu's most underrated filmmakers, finally recognized in the late '90s for his forays into pop art...
He was easily the studio's hippest director, interminably mixing contemporary music and fashionable events-of-the-day within the traditional pinku eiga format.
[8] He worked with Nikkatsu's top actresses, including Naomi Tani in Fairy in a Cage, Rope Hell (1978) and Fascination: Portrait of a Lady (1977), all of which were based on scripts by Oniroku Dan.
[10] In 1982 Ohara went to Hong Kong where he directed films for Golden Harvest, including the popular China Scandal: Exotic Dance, a co-production with Nikkatsu.