How many movies have Sumi Shimamoto and Yukiko Wakabayashi collaborated on?

They have worked on 2 movies together! Their first movie together was Children Who Chase Lost Voices (2011) while their highest rated movie together was Go! Anpanman: Twinkle! Princess Vanilla Of Ice Cream Land (2019). They have not worked together since Go! Anpanman: Twinkle! Princess Vanilla Of Ice Cream Land (2019).