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: Deadly Fight in Hiroshima (1973). They have not worked together since Hokuriku Proxy War (1977). They are most known for their crime films together.