How many movies have Katsuhiko Fujii and Oniroku Dan collaborated on?

They have worked on 11 movies together! Their first movie together was Cruelty: Black Rose Torture (1975) while their highest rated movie together was Oryu's Passion: Bondage Skin (1975). They have not worked together since Nun in Rope Hell (1984). They are most known for their drama films together.