Mai is a student of political science who became an intern for Dr. Briefs and Bulma Briefs' assistant. While working with the scientists, Mai came into contact with Planet Vegeta when Son Goku arrived on Earth, only to be followed by other Saiyans and Hatchiyack. Mai and Bulma became focused on understanding the Saiyans and when Goku returned to Earth, Mai assisted him in his war against Majin Buu and the Majins.