How many movies have Masato Kai and Momiji Yamamura collaborated on?

They have worked on 5 movies together! Their first movie together was The Woman Who Disappeared From Her Red Car (1998) and was their highest rated movie together. They have not worked together since Kyotaro Nishimura Travel Mystery 68: Disappearing Woman in Yamagata (2017). They are most known for their mystery films together.