How many movies have Shuko Okutani and Yuta Kiso collaborated on?

They have worked on 2 movies together! Their first movie together was Fafner: Heaven and Earth (2010) while their highest rated movie together was Demon Slayer -Kimetsu no Yaiba- The Movie: Mugen Train (2020). They have not worked together since Demon Slayer -Kimetsu no Yaiba- The Movie: Mugen Train (2020).