How many movies have Akiko Kumada and Ikue Otani collaborated on?

They have worked on 3 movies together! Their first movie together was Case Closed: The Fist of Blue Sapphire (2019) while their highest rated movie together was Detective Conan: The Scarlet Bullet (2021). They have not worked together since Detective Conan: The Bride of Halloween (2022). They are most known for their mystery films together.