How many movies have Masakazu Yokoyama and Naoko Matsui collaborated on?

They have worked on 8 movies together! Their first movie together was Case Closed: The Time Bombed Skyscraper (1997) while their highest rated movie together was Detective Conan: Episode One - The Great Detective Turned Small (2017). They have not worked together since Case Closed: The Fist of Blue Sapphire (2019). They are most known for their mystery films together.