How many movies have Ken Shintani and Nao Karino collaborated on?

They have worked on 3 movies together! Their first movie together was Case Closed: The Crimson Love Letter (2017) while their highest rated movie together was Go! Anpanman: Dororin and the Transformation Carnival (2022). They have not worked together since Go! Anpanman: Dororin and the Transformation Carnival (2022). They are most known for their animation films together.