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This is a story about an amazing city where only children live. But one day the unexpected happens - it is taken over by adults. They establish their own rules and regulations, which lead to disastrous consequences. But a new resident appears - a girl named Novenka. Together with her friends: Clever, Main, Guardian, Rude, Prankster and Calm, she has to overcome the uninvited guests, save the children from their oppression and answer the main question - is it worth growing up at all?