How many movies have Jin Aketagawa and Shunsuke Saitou collaborated on?

They have worked on 4 movies together! Their first movie together was Magical Girl Lyrical Nanoha: The Movie 1st (2010) 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.