How many movies have Michihiko Suwa and Naoko Matsui collaborated on?

They have worked on 8 movies together! Their first movie together was Case Closed: The Fourteenth Target (1998) 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: Episode One - The Great Detective Turned Small (2017). They are most known for their animation films together.