How many movies have Koichi Sakamoto and Rio Takanashi collaborated on?

They have worked on 1 movie together! Their first movie together was Kamen Rider Heisei Generations: Dr. Pac-Man vs. Ex-Aid & Ghost with Legend Riders (2016) and was their highest rated movie together. They have not worked together since Kamen Rider Heisei Generations: Dr. Pac-Man vs. Ex-Aid & Ghost with Legend Riders (2016).