How many movies have Koichi Sakamoto and Tsunekichi Ōmori collaborated on?

They have worked on 1 movie together! Their first movie together was Kamen Rider W Forever: A to Z/The Gaia Memories of Fate (2010) and was their highest rated movie together. They have not worked together since Kamen Rider W Forever: A to Z/The Gaia Memories of Fate (2010).