How many movies have Koji Ishii and Masaru Sato collaborated on?

They have worked on 4 movies together! Their first movie together was Zone of the Enders: Idolo (2001) while their highest rated movie together was Case Closed: The Crimson Love Letter (2017). They have not worked together since Case Closed: The Fist of Blue Sapphire (2019). They are most known for their animation films together.