How many movies have Kazuo Koike and Keiji Yoshitani collaborated on?

They have worked on 1 movie together! Their first movie together was Kōkōsei burai hikae: Kanjirū Muramasa (1973) and was their highest rated movie together. They have not worked together since Kōkōsei burai hikae: Kanjirū Muramasa (1973).