How many movies have Atsuhiro Iwakami and Hirotoshi Arai collaborated on?

They have worked on 5 movies together! Their first movie together was Puella Magi Madoka Magica the Movie Part III: Rebellion (2013) and was their highest rated movie together. They have not worked together since Fate/stay night: Heaven's Feel III. Spring Song (2020). They are most known for their fantasy films together.