How many movies have Masaaki Kudo and Mitsuru Sōma collaborated on?

They have worked on 2 movies together! Their first movie together was Go! Anpanman: When the Flower of Courage opens (1999) while their highest rated movie together was Road to Ninja: Naruto the Movie (2012). They have not worked together since Road to Ninja: Naruto the Movie (2012).