How many movies have Goro Kumon and Shintarō Katsu acted in together?

They have worked on 4 movies together! Their first movie together was Zatoichi Meets the One-Armed Swordsman (1971) while their highest rated movie together was Lone Wolf and Cub: Sword of Vengeance (1972). They have not worked together since Zatoichi's Conspiracy (1973). They are most known for their drama films together.