How many movies have Keiji Ota and Rikiya Koyama collaborated on?

They have worked on 10 movies together! Their first movie together was Lupin the Third vs. Detective Conan: The Movie (2013) while their highest rated movie together was My Hero Academia: Two Heroes (2018). They have not worked together since Detective Conan: The Bride of Halloween (2022). They are most known for their animation films together.