How many movies have Kappei Yamaguchi and Katsuo Ono collaborated on?

They have worked on 19 movies together! Their first movie together was Detective Conan: The Time Bombed Skyscraper (1997) while their highest rated movie together was Detective Conan: Episode One - The Great Detective Turned Small (2016). They have not worked together since Detective Conan: The Story of Ai Haibara: Black Iron Mystery Train (2023). They are most known for their animation films together.