How many movies have Rina Akiyama and Seiji Takaiwa collaborated on?

They have worked on 8 movies together! Their first movie together was Kamen Rider Den-O The Movie: I’m Born! (2007) 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 Yellow: Treasure de End Pirates (2010). They are most known for their adventure films together.