How many movies have Yuki Kaji and Yusuke Kubo collaborated on?

They have worked on 2 movies together! Their first movie together was Peacemaker Kurogane: Belief (2018) while their highest rated movie together was Donten: Laughing Under the Clouds - Gaiden: Chapter 3 - Conspiracy of the Military (2018). They have not worked together since Donten: Laughing Under the Clouds - Gaiden: Chapter 3 - Conspiracy of the Military (2018).