How many movies have Koji Endo and Masaki Okada collaborated on?

They have worked on 3 movies together! Their first movie together was Akko's Secret (2012) while their highest rated movie together was JoJo's Bizarre Adventure: Diamond is Unbreakable – Chapter 1 (2017). They have not worked together since The Many Faces of Ito: The Movie (2018). They are most known for their fantasy films together.