How many movies have Eiji Wakamatsu and Kaori Kobayashi 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 Mobile Suit Gundam Hathaway (2021). They have not worked together since Mobile Suit Gundam Hathaway (2021). They are most known for their action films together.