 Mukai made his debut as a director in 1962 with , an educational film.Wanting to direct, but lacking the educational requirements necessary to be hired as a director at a major studio, in 1965, Mukai moved into the lucrative new "pink film" genre.That year he founded Mukai Productions and, with financial backing from Nihon Cinema, directed his first "pink" feature, , which was distributed by Kokuei.