How many movies have Hiroshi Oikawa and Ruriko Watanabe collaborated on?

They have worked on 2 movies together! Their first movie together was Fafner in the Azure: Dead Aggressor - Heaven and Earth (2010) while their highest rated movie together was Yu-Gi-Oh!: The Dark Side of Dimensions (2016). They have not worked together since Yu-Gi-Oh!: The Dark Side of Dimensions (2016).