How many movies have Bin Amatsu and Seiji Yada collaborated on?

They have worked on 5 movies together! Their first movie together was Showdown of Men 2 (1967) while their highest rated movie together was Killer's Mission (1969). They have not worked together since Red Peony Gambler: Biographies of a Gambling Room (1969). They are most known for their drama films together.