How many movies have Hisao Shirai and Masaharu Sato collaborated on?

They have worked on 9 movies together! Their first movie together was The Tomb of Dracula (1980) while their highest rated movie together was Dr. Slump and Arale-chan: Hoyoyo! The Great Race Around The World (1983). They have not worked together since Crying Freeman 4: A Taste of Revenge (1991). They are most known for their animation films together.