How many movies have Akio Otsuka and Katsuyuki Sumisawa collaborated on?

They have worked on 7 movies together! Their first movie together was Inuyasha the Movie 3: Swords of an Honorable Ruler (2003) and was their highest rated movie together. They have not worked together since Mobile Suit Gundam: The Origin VI – Rise of the Red Comet (2018). They are most known for their animation films together.