How many movies have Saori Hayami and Yasumasa Koyama collaborated on?

They have worked on 5 movies together! Their first movie together was Girls und Panzer: The Movie (2015) while their highest rated movie together was Is It Wrong to Try to Pick Up Girls in a Dungeon?: Arrow of the Orion (2019). They have not worked together since Girls und Panzer das Finale: Part II (2019). They are most known for their animation films together.