How many movies have Ikue Otani and Ryotaro Okiayu acted in together?

They have worked on 10 movies together! Their first movie together was Detective Conan: Crossroad in the Ancient Capital (2003) while their highest rated movie together was One Piece: Stampede (2019). They have not worked together since Detective Conan: The Story of Ai Haibara: Black Iron Mystery Train (2023). They are most known for their animation films together.