How many movies have Mikio Narita and Tôru Nakajima collaborated on?

They have worked on 10 movies together! Their first movie together was New Battles Without Honor and Humanity 2: Head of the Boss (1975) while their highest rated movie together was Shadow Warriors: Hattori Hanzo (1980). They have not worked together since Ninja Hunt (1982). They are most known for their drama films together.