How many movies have Keiji Kameyama and Shuichi Oshima collaborated on?

They have worked on 9 movies together! Their first movie together was Kamen Rider Hibiki The Movie: Hibiki & The Seven War Oni (2005) while their highest rated movie together was Kamen Rider Den-O & Kiva: Climax Deka (2008). They have not worked together since Kamen Rider Build The Movie: Be The One (2018). They are most known for their adventure films together.