How many movies have Kappei Yamaguchi and Yasuhiro Saiki collaborated on?

They have worked on 4 movies together! Their first movie together was Inuyasha the Movie: Affections Touching Across Time (2001) while their highest rated movie together was Detective Conan: The Phantom of Baker Street (2002). They have not worked together since Case Closed: The Fist of Blue Sapphire (2019). They are most known for their animation films together.