[4] Still as Mamoru Kusumi, by November 1977 he also started acting in the Japanese softcore pornographic genre of pink film with a starring role in the Pro Taka studio movie Ijou seiyoku ma (異常性欲魔) for director Seiji Izumi.
[11][12] Kusumi continued making films for Shintōhō Eiga in the 1990s with Latest Soap Technique (最新ソープテクニック, Saishin sōpu tekunikku) directed by Toshiya Ueno, one of the "Seven Lucky Gods of Pink".
[13] He also worked for the budget pink film studio Tokatsu in their May 1990 release Wicked Salesman (悪を売る不良セールス, Aku o uru foryō sērusu).
In this movie, directed and written by Kōsuke Fujiwara, Kusumi plays a hapless newspaper salesman who receives some supernatural help in furthering his career through sexual techniques.
[14] Kusumi was the subject of an interview in the August 1994 issue of PG,[15] a "[s]pecialist Japanese magazine on pink films.