Sakura Kinomoto, a dozen-year-old girl, discovers one day, in her father's library, a mysterious book. As she opens it, she wakes Keroberos, Clow's card keeper, from the name of the great magician who created them. Each card has its own power: to control the water, the fire, to make an illusion. Only problem, the cards are no longer in the book. Keroberos then entrusts Sakura with the task of collecting all the cards before a disaster occurs. She becomes a card hunter ...