How many movies have Takeshi Sasaki and Tōru Hirayama collaborated on?

They have worked on 2 movies together! Their first movie together was All Together! Seven Kamen Riders!! (1976) while their highest rated movie together was Birth of the 10th! Kamen Riders All Together!!: Kamen Rider ZX (1984). They have not worked together since Birth of the 10th! Kamen Riders All Together!!: Kamen Rider ZX (1984).