How many movies have Toshihiko Sahashi and Toshihiko Seki collaborated on?

They have worked on 10 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 Kamen Rider Heisei Generations FOREVER (2018). They are most known for their science fiction films together.