How many movies have Kazuma Kawahara and Ryotaro Kosaka acted in together?

They have worked on 2 movies together! Their first movie together was Hyper Projection Play "Haikyū!" (2016) while their highest rated movie together was Hyper Projection Play "Haikyuu!!" Karasuno, Revival! (2017). They have not worked together since Hyper Projection Play "Haikyuu!!" Karasuno, Revival! (2017).