How many movies have Kazuki Nishiwaki and Yuki Yamaguchi collaborated on?

They have worked on 6 movies together! Their first movie together was Gyo: Tokyo Fish Attack (2012) while their highest rated movie together was Tales of Zestiria: The Shepherd's Advent (2014). They have not worked together since Fate/stay night: Heaven's Feel II. Lost Butterfly (2019). They are most known for their animation films together.