How many movies have Chiharu Niiyama and Koichi Yamadera acted in together?

They have worked on 1 movie together! Their first movie together was Godzilla, Mothra and King Ghidorah: Giant Monsters All-Out Attack (2001) and was their highest rated movie together. They have not worked together since Godzilla, Mothra and King Ghidorah: Giant Monsters All-Out Attack (2001).