How many movies have Kazuo Koike and Tsutomu Nakamura collaborated on?

They have worked on 5 movies together! Their first movie together was Lone Wolf and Cub: Baby Cart in the Land of Demons (1973) while their highest rated movie together was Lone Wolf and Cub: The Final Conflict (1993). They have not worked together since Lone Wolf and Cub: The Final Conflict (1993). They are most known for their drama films together.