How many movies have Kumiko Yamauchi and Mika Kanai collaborated on?

They have worked on 4 movies together! Their first movie together was Go! Anpanman: Ruby's Wish (2003) while their highest rated movie together was Go! Anpanman: Star-Spirited Dollie (2006). They have not worked together since Go! Anpanman: Dororin and the Transformation Carnival (2022). They are most known for their family films together.