How many movies have Keisuke Kato and Ryuta Tasaki collaborated on?

They have worked on 2 movies together! Their first movie together was Kamen Rider Kiva: King of the Castle in the Demon World (2008) and was their highest rated movie together. They have not worked together since Kamen Rider × Kamen Rider Gaim & Wizard: The Fateful Feudal Movie Wars (2013).