How many movies have Kaori Yamada and Rikiya Koyama collaborated on?

They have worked on 5 movies together! Their first movie together was Detective Conan: The Darkest Nightmare (2016) while their highest rated movie together was The Tunnel to Summer, the Exit of Goodbyes (2022). They have not worked together since The Tunnel to Summer, the Exit of Goodbyes (2022). They are most known for their animation films together.