How many movies have Mami Koyama and Risa Suzuki collaborated on?

They have worked on 2 movies together! Their first movie together was Detective Conan: The Darkest Nightmare (2016) 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: Episode One - The Great Detective Turned Small (2017).