How many movies have Fûtarô Yamada and Tatsuo Endō collaborated on?

They have worked on 4 movies together! Their first movie together was Ninja's Mark (1968) while their highest rated movie together was Female Ninjas Magic Chronicles 3: Sacred Book of Sexual Positions (1993). They have not worked together since Female Ninjas Magic Chronicles 4: Rebel Forces at the Threshold (1994). They are most known for their action films together.