How many movies have Kazuo Koike and Toyohiko Inagaki collaborated on?

They have worked on 2 movies together! Their first movie together was Lone Wolf and Cub: Baby Cart to Hades (1972) while their highest rated movie together was Lone Wolf and Cub: Baby Cart in Peril (1972). They have not worked together since Lone Wolf and Cub: Baby Cart in Peril (1972).