How many movies have Hiroko Kasahara and Masako Watanabe collaborated on?

They have worked on 1 movie together! Their first movie together was 3丁目のタマ おねがい！モモちゃんを捜して！！ (1993) and was their highest rated movie together. They have not worked together since 3丁目のタマ おねがい！モモちゃんを捜して！！ (1993).