How many movies have Reina Yamauchi and Tomokazu Seki collaborated on?

They have worked on 4 movies together! Their first movie together was Yo-kai Watch: The Movie (2014) while their highest rated movie together was Yo-kai Watch Shadowside: Resurrection of the Demon King (2017). They have not worked together since Yo-kai Watch Jam: Yo-kai Academy Y - Can a Cat Be a Hero? (2019). They are most known for their fantasy films together.