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The story takes place in a magical world called Fairy Castle. Black fairy Xiao Yue (played by Zhou Jiao) secretly practices black magic and plans to steal the Fairy Magic Stone. Fairy Xiao Lan (played by Liao Jingxuan), who guards the Fairy Magic Stone, comes to the human world to search for its whereabouts and hides in a music box. She accidentally meets the kind sisters Ling Mei Qi (played by Sun Zhen) and Ling Mei Xue (played by Huang Anyi). Xiao Lan moves into the sisters' home, transforming herself into their nanny. The three of them share a life filled with happiness and joy, forming a deep friendship. The Fairy Queen (played by Wang Hui) specially allows Xiao Lan to teach the sisters magic, turning Mei Qi and Mei Xue into Little Fairies. Meanwhile, Xiao Yue meets a girl named Yan Lili (played by Liu Meihan) in the human world and turns her into a Little Black Fairy. In the human world, a war between justice and evil is about to begin.