How many movies have Fumito Nanba and Masafumi Watanabe collaborated on?

They have worked on 2 movies together! Their first movie together was Donten: Laughing Under the Clouds - Gaiden: Chapter 1 - One Year After the Battle (2017) and was their highest rated movie together. They have not worked together since Natsume's Book of Friends: Ephemeral Bond (2018).