How many movies have Kappei Yamaguchi and Michihiko Suwa collaborated on?

They have worked on 8 movies together! Their first movie together was Kindaichi Case Files Movie 1: The Opera House Murders (1996) while their highest rated movie together was Inuyasha the Movie: Affections Touching Across Time (2001). They have not worked together since Detective Conan: Episode One - The Great Detective Turned Small (2016). They are most known for their animation films together.