How many movies have Izumi Hirabayashi and Kayo Kojio collaborated on?

They have worked on 4 movies together! Their first movie together was Fullmetal Alchemist the Movie: The Sacred Star of Milos (2011) while their highest rated movie together was Maquia: When the Promised Flower Blooms (2018). They have not worked together since SHIROBAKO the Movie (2020). They are most known for their animation films together.