How many movies have Ryusei Nakao and Shunji Ôga collaborated on?

They have worked on 3 movies together! Their first movie together was Go! Anpanman: The Pyramid of the Rainbow (1997) and was their highest rated movie together. They have not worked together since Go! Anpanman: The Secret of Roll and Lola's Floating Castle (2002). They are most known for their family films together.