How many movies have Iwao Kasumi and Shintarō Katsu acted in together?

They have worked on 3 movies together! Their first movie together was Dynamite Doctor (1966) while their highest rated movie together was Lone Wolf and Cub: Sword of Vengeance (1972). They have not worked together since New Hoodlum Soldier Story: Firing Line (1972). They are most known for their action films together.