How many movies have Koji Okumura and Yoshio Kitazawa collaborated on?

They have worked on 6 movies together! Their first movie together was Dan Oniroku: Yôen nômen jigoku (1988) while their highest rated movie together was Freeway Speedway 5 (1992). They have not worked together since Megalopolis Express Way Trial Max (1996). They are most known for their action films together.