How many movies have Akio Otsuka and Masumi Hattori collaborated on?

They have worked on 3 movies together! Their first movie together was Sin: The Movie (2000) while their highest rated movie together was Yo-kai Watch Shadowside: Resurrection of the Demon King (2017). They have not worked together since Psycho-Pass 3: First Inspector (2020). They are most known for their animation films together.