How many movies have Mami Koyama and Megumi Hayashibara acted in together?

They have worked on 10 movies together! Their first movie together was Riding Bean (1989) while their highest rated movie together was Detective Conan: Episode One - The Great Detective Turned Small (2017). They have not worked together since Detective Conan: Black Iron Submarine (2023). They are most known for their animation films together.