How many movies have Hisayasu Satô and Rie Asai collaborated on?

They have worked on 3 movies together! Their first movie together was Niizuma kahanshin: Washizukami (1991) while their highest rated movie together was Umagoya no reijô (1991). They have not worked together since Kaikan onanie: Niizuma-hen (1993). They are most known for their horror films together.