How many movies have Akira Koga and Takumi Takatsuma collaborated on?

They have worked on 2 movies together! Their first movie together was Goblin Slayer -Goblin's Crown- (2020) while their highest rated movie together was Teasing Master Takagi-san: The Movie (2022). They have not worked together since Teasing Master Takagi-san: The Movie (2022).