How many movies have Haruyasu Ito and Shōgorō Nishimura collaborated on?

They have worked on 8 movies together! Their first movie together was White Uniform in Rope Hell (1980) 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).