How many movies have Hiroshi Butsuda and Tsuyoshi Koyama collaborated on?

They have worked on 4 movies together! Their first movie together was Kamen Rider Ryuki: EPISODE FINAL (2002) while their highest rated movie together was Kamen Rider 555: Paradise Lost (2003). They have not worked together since Heisei Rider vs. Showa Rider: Kamen Rider Wars feat. Super Sentai (2014). They are most known for their adventure films together.