How many movies have Seiji Abe and Tôru Hirayama collaborated on?

They have worked on 4 movies together! Their first movie together was All Together! Seven Kamen Riders!! (1976) while their highest rated movie together was Kamen Rider: Eight Riders vs. Galaxy King (1980). They have not worked together since Birth of the 10th! Kamen Riders All Together!! (1984). They are most known for their adventure films together.