How many movies have Ryusei Nakao and Sumi Shimamoto acted in together?

They have worked on 16 movies together! Their first movie together was Shuten Doji - The Star Hand Kid (1989) while their highest rated movie together was Go! Anpanman: Tears of the Mermaid Princess (2000). They have not worked together since Go! Anpanman: Roboly and the Warming Present (2023). They are most known for their animation films together.