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Sumireko Usami (宇佐見 菫子 Usami Sumireko) is a human from the Outside World with psychic abilities, and the final boss of Urban Legend in Limbo.
She has brown eyes and shoulder-length brown hair. Wears a black hat with a white bow on her head, also wears red-framed glasses. Her dress may be a school uniform, consisting of a pink + purple plaid dress, over a long-sleeved blouse. Over her dress she has a black, high-collared cape with a red interior inscribed with runes. On her feet she wears white socks with bows, and black shoes. She also carries a tablet computer with a pentagram drawn on the back and zener cards
Her connections to Renko Usami are currently unknown. Though it is speculated that she is related to Renko.