How many movies have Nobumasa Fukushima and Oniroku Dan collaborated on?

They have worked on 8 movies together! Their first movie together was Oryu's Passion: Bondage Skin (1975) while their highest rated movie together was Dan Oniroku: Ikenie shimai (1987). They have not worked together since Dan Oniroku: Ikenie shimai (1987). They are most known for their horror films together.