How many movies have Kosuke Hayashi and Masaki Yoshizaki collaborated on?

They have worked on 3 movies together! Their first movie together was Fullmetal Alchemist the Movie: The Sacred Star of Milos (2011) while their highest rated movie together was K-On! The Movie (2011). They have not worked together since Napping Princess (2017). They are most known for their animation films together.