How many movies have Koichi Yamadera and Rie Nishiyama collaborated on?

They have worked on 2 movies together! Their first movie together was Go! Anpanman: The Shining Star's Tear (1989) and was their highest rated movie together. They have not worked together since Crayon Shin-chan: Dengeki! Buta no Hizume Daisakusen (1998).