Sakura accidentally unleashes the magical Clow Cards, awakening the cards' guardian, Cerberus, who appoints Sakura the role of Cardcaptor - to catch and seal the cards using the Clow Wand.

Tomoyo meets Cerberus after she discovers Sakura's secret and becomes involved in Sakura's quest.

On the way to school, Sakura meets Maki Matsumoto, who is opening a shop called Twin Bells, and finds the Jump Card, which escapes with all the stuffed dolls in the shop.

Naoko informs Sakura and her friends of an encounter with a strange phantom in the woods behind the school.