How many movies have Ryo Inoguchi and Ryusei Nakao collaborated on?

They have worked on 1 movie together! Their first movie together was Go! Anpanman: The Secret of Roll and Lola's Floating Castle (2002) 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).