How many movies have Hitoshi Nishiyama and Rikiya Koyama collaborated on?

They have worked on 9 movies together! Their first movie together was Lupin the Third vs. Detective Conan: The Movie (2013) while their highest rated movie together was Detective Conan: Episode One - The Great Detective Turned Small (2017). They have not worked together since Case Closed: The Million-Dollar Pentagram (2024). They are most known for their animation films together.