How many movies have Mari Okada and Yutaka Hara collaborated on?

They have worked on 2 movies together! Their first movie together was Zorori the Naughty Hero: Quest For The Mysterious Treasure (2006) while their highest rated movie together was Zorori the Naughty Hero: Heroes of Space (2015). They have not worked together since Zorori the Naughty Hero: Heroes of Space (2015).