How many movies have Tetsuya Matsukawa and Tomoko Nitta collaborated on?

They have worked on 4 movies together! Their first movie together was Fairy Tail: Phoenix Priestess (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 City Hunter: Shinjuku Private Eyes (2019). They are most known for their animation films together.