How many movies have Keiko Kaga and Shōji Sakai collaborated on?

They have worked on 2 movies together! Their first movie together was Meiki Hitosuji (1989) while their highest rated movie together was Seifuku nusumi-dori-ma: Gekisha naburu (1990). They have not worked together since Seifuku nusumi-dori-ma: Gekisha naburu (1990).