How many movies have Eiji Wakamatsu and Maaya Sakamoto 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 Is It Wrong to Try to Pick Up Girls in a Dungeon?: Arrow of the Orion (2019). They have not worked together since Fate/Grand Order the Movie: Divine Realm of the Round Table: Camelot Wandering; Agateram (2020). They are most known for their fantasy films together.