How many movies have Sayaka Ohara and Tomoko Hamanaka collaborated on?

They have worked on 4 movies together! Their first movie together was Donten: Laughing Under the Clouds - Gaiden: Chapter 3 - Conspiracy of the Military (2018) and was their highest rated movie together. They have not worked together since Aria the Crepuscolo (2021). They are most known for their animation films together.