How many movies have Katsuya Kobayashi and Kyouhei Yamaguchi collaborated on?

They have worked on 1 movie together! Their first movie together was Kamen Rider Build NEW WORLD: Kamen Rider Cross-Z (2019) and was their highest rated movie together. They have not worked together since Kamen Rider Build NEW WORLD: Kamen Rider Cross-Z (2019).