How many movies have Rikiya Koyama and Takahiro Ito collaborated on?

They have worked on 1 movie together! Their first movie together was Fate/kaleid liner Prisma☆Illya: Vow in the Snow (2017) and was their highest rated movie together. They have not worked together since Fate/kaleid liner Prisma☆Illya: Vow in the Snow (2017).