How many movies have Katsumi Nakazawa and Shinji Yamada collaborated on?

They have worked on 9 movies together! Their first movie together was Nympho Diver: G-String Festival (1981) while their highest rated movie together was Female Teacher: In Front of the Students (1982). They have not worked together since Spectacle of Buds (1986). They are most known for their drama films together.