How many movies have Koichi Sakamoto and Kotaro Nakagawa collaborated on?

They have worked on 9 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 Super Sentai Strongest Battle Director's Cut (2019). They have not worked together since Kamen Rider Jeanne & Kamen Rider Aguilera with Girls Remix (2023). They are most known for their action films together.