How many movies have Hirotoshi Arai and Kaori Fujii collaborated on?

They have worked on 4 movies together! Their first movie together was Fireworks (2017) while their highest rated movie together was Fate/stay night: Heaven's Feel III. Spring Song (2020). They have not worked together since Fate/stay night: Heaven's Feel III. Spring Song (2020). They are most known for their drama films together.