How many movies have Seiji Takaiwa and Yoshifumi Oshikawa collaborated on?

They have worked on 8 movies together! Their first movie together was Kamen Rider 555: Paradise Lost (2003) 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 Trilogy - Episode Red: Zero's Star Twinkle (2010). They are most known for their adventure films together.