How many movies have Toshihiko Sahashi and Yoshitaka Nakajima collaborated on?

They have worked on 2 movies together! Their first movie together was Kamen Rider Zi-O the Movie: Over Quartzer (2019) while their highest rated movie together was Kamen Rider Geats: 4 Aces and the Black Fox (2023). They have not worked together since Kamen Rider Geats: 4 Aces and the Black Fox (2023).