How many movies have Katsumi Akimoto and Saori Iwatani collaborated on?

They have worked on 4 movies together! Their first movie together was The Last: Naruto the Movie (2014) while their highest rated movie together was Is It Wrong to Try to Pick Up Girls in a Dungeon?: Arrow of the Orion (2019). They have not worked together since Fortune Favors Lady Nikuko (2021). They are most known for their animation films together.