Sakura Kinomoto, a ten-year old, experiences dreams involving a peculiar book and Tokyo Tower. After returning home from school, Sakura is drawn to the basement by strange noises. In her father's library, she discovers the Clow Book, the same book from her dream. She accidentally breaks its seal, unleashing the magical Clow Cards into the world. The cards' guardian, Cerberus, awakens and appoints Sakura the role of Cardcaptor - to catch and seal the cards using the Clow Wand. They successfully catch the Fly Card, allowing Sakura to fly.