How many movies have Kazuhiro Maruyama and Keiko Matsuzaka collaborated on?

They have worked on 1 movie together! Their first movie together was Golden Flower: What Is Hidden Is the True Flower, What Is Gone Is the Butterfly (2009) and was their highest rated movie together. They have not worked together since Golden Flower: What Is Hidden Is the True Flower, What Is Gone Is the Butterfly (2009).