How many movies have Akira Yamakawa and Katsumi Akimoto collaborated on?

They have worked on 2 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 Is It Wrong to Try to Pick Up Girls in a Dungeon?: Arrow of the Orion (2019).