How many movies have Ikue Otani and Yoshiharu Ashino collaborated on?

They have worked on 6 movies together! Their first movie together was Case Closed: The Time Bombed Skyscraper (1997) while their highest rated movie together was Detective Conan: The Phantom of Baker Street (2002). They have not worked together since Detective Conan: Jolly Roger in the Deep Azure (2007). They are most known for their adventure films together.