How many movies have Koichi Yamadera and Yutaka Hara collaborated on?

They have worked on 4 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: La La La♪ A Star is Born (2022). They are most known for their animation films together.