How many movies have Ayumi Takasaki and Kaori Masaki collaborated on?

They have worked on 4 movies together! Their first movie together was Case Closed: The Crimson Love Letter (2017) while their highest rated movie together was Natsume's Book of Friends: Ephemeral Bond (2018). They have not worked together since Her Blue Sky (2019). They are most known for their animation films together.