How many movies have Megumi Hayashibara and Ryota Yamaguchi collaborated on?

They have worked on 2 movies together! Their first movie together was Ranma ½: The Movie — The Battle of Nekonron: The Fight to Break the Rules! (1991) while their highest rated movie together was Ranma ½: The Movie 2 — The Battle of Togenkyo: Rescue the Brides! (1992). They have not worked together since Ranma ½: The Movie 2 — The Battle of Togenkyo: Rescue the Brides! (1992).