How many movies have Mikihiro Iwata and Shunsuke Saitou collaborated on?

They have worked on 3 movies together! Their first movie together was anohana: The Flower We Saw That Day - The Movie (2013) while their highest rated movie together was The Anthem of the Heart (2015). They have not worked together since Her Blue Sky (2019). They are most known for their animation films together.