How many movies have Toshihiro Sakai and Yuriko Hirooka collaborated on?

They have worked on 1 movie together! Their first movie together was I'm not Afraid of the Hospital. The Reason I got Sick 2! (1994) and was their highest rated movie together. They have not worked together since I'm not Afraid of the Hospital. The Reason I got Sick 2! (1994).