Ranma and Usagi both run away, they meet each other and decide to take a ship to America. Usagi’s friends and family abandoned her and threw her out, believing she isn’t the true princess. Ranma had gotten fed up of the fiance mess and a new attempt to force him to marry Akane. They fall through a portal to the DBZ world where they are trained by the Saiyans. When they return they travel around America killing monsters being sent after them. (Sailor Moon Crossover.)