How many movies have Chika Hirabuki and Harumi Okamoto collaborated on?

They have worked on 5 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 The Girl from the Other Side (2023). They are most known for their fantasy films together.