How many movies have Akira Ishida and Keiko Tamaki collaborated on?

They have worked on 2 movies together! Their first movie together was Library War: The Wings Of Revolution (2012) while their highest rated movie together was Cells at Work!: A Gut-wrenching Resurrection of the Formidable Enemy! (2020). They have not worked together since Cells at Work!: A Gut-wrenching Resurrection of the Formidable Enemy! (2020).