How many movies have Keiichi Okabe and Yui Ishikawa collaborated on?

They have worked on 5 movies together! Their first movie together was NieR Music Concert & Talk Live (2016) while their highest rated movie together was NieR Music Concert: The Memories of Puppets (2017). They have not worked together since NieR: Theatrical Orchestra 12020 (2020). They are most known for their music films together.