How many movies have Chiwa Saito and Ken Naito collaborated on?

They have worked on 5 movies together! Their first movie together was Puella Magi Madoka Magica the Movie Part I: Beginnings (2012) while their highest rated movie together was Puella Magi Madoka Magica the Movie Part III: Rebellion (2013). They have not worked together since Student Council Staff Members Movie 2 (2021). They are most known for their animation films together.