How many movies have Kazuo Kato and Toru Ishii collaborated on?

They have worked on 5 movies together! Their first movie together was Kamen Rider: The Next (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 & Decade NEO Generations: The Onigashima Warship (2009). They are most known for their science fiction films together.