How many movies have Nobuo Yajima and Shunsuke Kikuchi collaborated on?

They have worked on 4 movies together! Their first movie together was Terror Beneath the Sea (1966) while their highest rated movie together was Kamen Rider: Eight Riders vs. Galaxy King (1980). They have not worked together since Kamen Rider Super-1: The Movie (1981). They are most known for their science fiction films together.