How many movies have Shigeru Nishiyama and Tomomi Kawatsuma collaborated on?

They have worked on 5 movies together! Their first movie together was anohana: The Flower We Saw That Day - The Movie (2013) while their highest rated movie together was Dou kyu sei – Classmates (2016). They have not worked together since Lonely Castle in the Mirror (2022). They are most known for their animation films together.