How many movies have Shigeru Nishiyama and Tomonori Ochikoshi collaborated on?

They have worked on 4 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 Sword Art Online: The Movie – Ordinal Scale (2017). They are most known for their animation films together.