How many movies have Etsuji Yamada and Koichi Yamadera collaborated on?

They have worked on 2 movies together! Their first movie together was Go! Anpanman: Nosshi the Dinosaur's Big Adventure (1993) while their highest rated movie together was Go! Anpanman: The Pyramid of the Rainbow (1997). They have not worked together since Go! Anpanman: The Pyramid of the Rainbow (1997).