How many movies have Keiji Kameyama and Yoshifumi Oshikawa collaborated on?

They have worked on 6 movies together! Their first movie together was Kamen Rider Kabuto: God Speed Love (2006) while their highest rated movie together was Kamen Rider Den-O & Kiva: Climax Deka (2008). They have not worked together since Super Kamen Rider Den-O & Decade NEO Generations: The Onigashima Warship (2009). They are most known for their adventure films together.