How many movies have Akira Kamiya and Yoshinori Nakai collaborated on?

They have worked on 4 movies together! Their first movie together was Kinnikuman: Great Riot! Justice Chojin (1984) while their highest rated movie together was Kinnikuman: Justice Superman vs. Ancient Superman (1985). They have not worked together since Kinnikuman: New York Close Call! (1986). They are most known for their animation films together.