How many movies have Ai Kayano and Kiyoshi Sugiyama collaborated on?

They have worked on 3 movies together! Their first movie together was Girls und Panzer: The Movie (2015) while their highest rated movie together was Girls und Panzer das Finale: Part III (2021). They have not worked together since Girls und Panzer das Finale: Part III (2021). They are most known for their animation films together.