How many movies have Ken Murakami and Takashi Watanabe collaborated on?

They have worked on 4 movies together! Their first movie together was Shimajiro and the Song of the Whale (2014) while their highest rated movie together was Shimajiro and the Rainbow Oasis (2017). They have not worked together since Shimajiro and the Rainbow Oasis (2017). They are most known for their animation films together.