How many movies have Kyoko Kotani and Tetsuya Wakano collaborated on?

They have worked on 4 movies together! Their first movie together was Blue Exorcist: The Movie (2012) while their highest rated movie together was Donten: Laughing Under the Clouds - Gaiden: Chapter 3 - Conspiracy of the Military (2018). They have not worked together since Donten: Laughing Under the Clouds - Gaiden: Chapter 3 - Conspiracy of the Military (2018). They are most known for their fantasy films together.