How many movies have Kazuhiro Oki and Tatsuya Oka collaborated on?

They have worked on 6 movies together! Their first movie together was eX-Driver the Movie (2002) while their highest rated movie together was Lupin the Third: Swallowtail Tattoo (2004). They have not worked together since Eureka: Eureka Seven Hi-Evolution (2021). They are most known for their animation films together.