How many movies have Oniroku Dan and Ran Masaki collaborated on?

They have worked on 3 movies together! Their first movie together was Beautiful Teacher in Torture Hell (1985) while their highest rated movie together was Flower and Snake 4: White Uniform Rope Slave (1986). They have not worked together since Flower and Snake 4: White Uniform Rope Slave (1986). They are most known for their drama films together.