How many movies have Reina Kawasaki and Sayaka Ohara collaborated on?

They have worked on 4 movies together! Their first movie together was Donten: Laughing Under the Clouds - Gaiden: Chapter 1 - One Year After the Battle (2017) while their highest rated movie together was Donten: Laughing Under the Clouds - Gaiden: Chapter 3 - Conspiracy of the Military (2018). They have not worked together since Made in Abyss: Dawn of the Deep Soul (2020). They are most known for their fantasy films together.