How many movies have Junichi Arai and Kazuhiro Wakabayashi collaborated on?

They have worked on 4 movies together! Their first movie together was Eureka Seven Hi-Evolution (2017) while their highest rated movie together was Josee, the Tiger and the Fish (2020). They have not worked together since Eureka: Eureka Seven Hi-Evolution (2021). They are most known for their drama films together.