How many movies have Kazunari Kouchi and Wataru Takagi collaborated on?

They have worked on 15 movies together! Their first movie together was Case Closed: The Time Bombed Skyscraper (1997) while their highest rated movie together was Detective Conan: Captured in Her Eyes (2000). They have not worked together since Detective Conan: Dimensional Sniper (2014). They are most known for their animation films together.