How many movies have Kazuo Koike and Ryūnosuke Ono collaborated on?

They have worked on 4 movies together! Their first movie together was Crying Freeman 2: Shades of Death, Part 1 (1989) while their highest rated movie together was Crying Freeman 3: Shades of Death, Part 2 (1990). They have not worked together since Crying Freeman 5: Abduction in Chinatown (1992). They are most known for their animation films together.