How many movies have Ryusei Nakao and Yasutaka Hanabusa collaborated on?

They have worked on 2 movies together! Their first movie together was Go! Anpanman: The Secret of Roll and Lola's Floating Castle (2002) while their highest rated movie together was Go! Anpanman: Star-Spirited Dollie (2006). They have not worked together since Go! Anpanman: Star-Spirited Dollie (2006).