How many movies have Kōjiro Shirakawa and Toshiaki Tsushima collaborated on?

They have worked on 9 movies together! Their first movie together was Trials of an Okinawa Village (1971) while their highest rated movie together was Battles Without Honor and Humanity (1973). They have not worked together since Hokuriku Proxy War (1977). They are most known for their crime films together.