How many movies have Ayako Kawasumi and Eiko Hirayama collaborated on?

They have worked on 3 movies together! Their first movie together was Girls und Panzer das Finale: Part I (2017) while their highest rated movie together was Natsume's Book of Friends: Ephemeral Bond (2018). They have not worked together since Girls und Panzer das Finale: Part II (2019). They are most known for their animation films together.