How many movies have Kappei Yamaguchi and Yukitoshi Hori acted in together?

They have worked on 6 movies together! Their first movie together was Case Closed: Countdown to Heaven (2001) while their highest rated movie together was Detective Conan: Episode One - The Great Detective Turned Small (2017). They have not worked together since Detective Conan: Black Iron Submarine (2023). They are most known for their animation films together.