How many movies have Koichi Sakamoto and Mitsuru Matsuoka collaborated on?

They have worked on 2 movies together! Their first movie together was Kamen Rider W Forever: A to Z/The Gaia Memories of Fate (2010) while their highest rated movie together was Kamen Rider W Returns: Kamen Rider Eternal (2011). They have not worked together since Kamen Rider W Returns: Kamen Rider Eternal (2011).