10-year-old Yuu Morisawa used to live an ordinary life, until she sees a giant ship floating in the sky. Carried into the ship, she helps a friendly alien named Pino Pino find the Feather Star. As a token of his gratitude for her assistance, he gives Yuu a magic wand, which allows her to transform into a 16-year-old girl, for one year. While wandering through the city, she accidentally ends up on TV and is asked to sing, which the magic enables her to do remarkably well. Under the alias Creamy Mami, Yuu becomes an overnight success, and is soon sought to begin a professional career as an idol singer under Parthenon Productions.
