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Yuko Ichihara is a woman who runs a shop that deals in granting wishes in exchange for something of equal value to the wish; sometimes this is referred to as a soul. She can take anything from a precious object to abstract concepts, such as love and luck in exchange. She usually displays an immature and free-spirited attitude, drinking sake at all hours of the day and forcing difficult tasks upon Watanuki.

Source from Wikipeida