How many movies have Satoshi Sakai and Yoshikazu Iwanami collaborated on?

They have worked on 5 movies together! Their first movie together was Girls und Panzer: The Movie (2015) while their highest rated movie together was Sword Art Online: The Movie – Ordinal Scale (2017). They have not worked together since Child of Kamiari Month (2021). They are most known for their animation films together.