How many movies have Kazunori Iwakura and Takahiro Tanaka collaborated on?

They have worked on 4 movies together! Their first movie together was Slayers Return (1996) while their highest rated movie together was Revolutionary Girl Utena: The Adolescence of Utena (1999). They have not worked together since Digimon: The Movie (2000). They are most known for their animation films together.