How many movies have Kenji Utsumi and Toyoo Ashida collaborated on?

They have worked on 4 movies together! Their first movie together was Doctor Mambo & Kaitou Jibako: Uchuu yori Ai wo Komete (1983) while their highest rated movie together was Fist of the North Star (1986). They have not worked together since Fist of the North Star - TV Compilation 3 - Legend of the Conqueror of Century's End - Raoh Must Die! (1988). They are most known for their science fiction films together.