How many movies have Marefumi Niibayashi and Satoshi Iwataki collaborated on?

They have worked on 3 movies together! Their first movie together was Berserk: The Golden Age Arc II - The Battle for Doldrey (2012) while their highest rated movie together was maboroshi (2023). They have not worked together since maboroshi (2023). They are most known for their animation films together.