How many movies have Ikue Otani and Mayumi Yamamoto collaborated on?

They have worked on 3 movies together! Their first movie together was Detective Conan: The Last Wizard of the Century (1999) while their highest rated movie together was Detective Conan: The Phantom of Baker Street (2002). They have not worked together since Detective Conan: The Phantom of Baker Street (2002). They are most known for their animation films together.