How many movies have Rikiya Koyama and Ryoichiro Matsuo collaborated on?

They have worked on 2 movies together! Their first movie together was Pompo the Cinephile (2021) 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).