How many movies have Seizō Fukumoto and Tôru Nakajima collaborated on?

They have worked on 8 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 Shogun's Samurai (1978). They have not worked together since Aftermath of Battles Without Honor and Humanity (1979). They are most known for their action films together.