How many movies have Akiko Yajima and Masahiko Matsuyama collaborated on?

They have worked on 9 movies together! Their first movie together was Crayon Shin-chan: The Hidden Treasure of the Buri Buri Kingdom (1994) while their highest rated movie together was Crayon Shin-chan: Super-Dimension! The Storm Called My Bride (2010). They have not worked together since Crayon Shin-chan: Invoke a Storm! Me and the Space Princess (2012). They are most known for their animation films together.