How many movies have Mamiko Nakanishi and Shuji Maruyama collaborated on?

They have worked on 6 movies together! Their first movie together was Eden of the East Movie I: The King of Eden (2009) while their highest rated movie together was New Initial D the Movie - Legend 2: Racer (2015). They have not worked together since That Time I Got Reincarnated as a Slime the Movie: Scarlet Bond (2022). They are most known for their animation films together.