How many movies have Kim Hyun-soo and Youichirou Yamamoto collaborated on?

They have worked on 3 movies together! Their first movie together was Saint☆Young Men (2013) while their highest rated movie together was Sword Art Online: The Movie – Ordinal Scale (2017). They have not worked together since Sword Art Online: The Movie – Ordinal Scale (2017). They are most known for their animation films together.