How many movies have Keiko Yokozawa and Megumi Sugihara collaborated on?

They have worked on 1 movie together! Their first movie together was It's the Sea! Let's Set Sail! Niko Niko, Pun (1990) and was their highest rated movie together. They have not worked together since It's the Sea! Let's Set Sail! Niko Niko, Pun (1990).