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Yuu Morisawa is a twelve year old girl who lives with her mother and father in their crepe shop. One day she sees a giant ship in the sky and follows it. After being transported into the ship she helps an alien names Pino Pino find his way home to feather star. In return he gives her magical powers to use as she wishes for a year, as well as the alien cats Poji and Nega. Yuu finds that this power gives her the ability to grow into a sixteen year old and after chancing upon a television apperance she becomes the magical idol Creamy Mami. However she soon finds out how hard it is to juggle being an idol and a normal girl without being caught.