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In a world overrun by monstrous creatures called grimm and dangers worse than those. There is a system of levels, danger levels if you will, the highest of which is level 5 starting with creatures of the grimm, hunters and huntresses, Glynda Goodwitch, Qrow Branwen, General James Ironwood, Headmaster of Beacon Ozpin, Mikoto Misaka, Kakine Teitoku and the top rank, Accelerator.