How many movies have Takayuki Tanaka and Yuki Kaji collaborated on?

They have worked on 3 movies together! Their first movie together was Black Butler: Book of Murder (2014) and was their highest rated movie together. 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 animation films together.