How many movies have Mamiko Nakanishi and Tomotsugu Sakakibara collaborated on?

They have worked on 2 movies together! Their first movie together was Steins;Gate: The Movie - Load Region of Déjà Vu (2013) and was their highest rated movie together. They have not worked together since Space Battleship Yamato 2199: Odyssey of the Celestial Ark (2014).