How many movies have Kenji Kawai and Yukiaki Kiyama collaborated on?

They have worked on 2 movies together! Their first movie together was Kamen Rider Heisei Generations FINAL: Build & Ex-Aid with Legend Riders (2017) while their highest rated movie together was Kamen Rider Build The Movie: Be The One (2018). They have not worked together since Kamen Rider Build The Movie: Be The One (2018).