How many movies have Naoki Arakawa and Naoki Kitagawa collaborated on?

They have worked on 3 movies together! Their first movie together was Eden of the East Movie I: The King of Eden (2009) while their highest rated movie together was Haikyuu!! The Movie: The End and the Beginning (2015). They have not worked together since Haikyuu!! The Movie: The End and the Beginning (2015). They are most known for their animation films together.