Ten-year-old Sakura Kinomoto is an ordinary fourth-grade student living in Tomoeda until, one day, she comes across a mysterious book of cards titled "The Clow." While pondering her discovery, she accidentally triggers a magical gust of wind that scatters the cards throughout the town. The incident awakens the Beast of the Seal—Keroberos, nicknamed "Kero"—who informs Sakura that she has released the mystical "Clow Cards" created by the sorcerer Clow Reed. Because each Card can act independently and possesses incredible power, Clow had sealed them away. Now that they are free, the Cards pose a significant danger to the world, and it falls to Sakura to stop them. Naming Sakura the "Cardcaptor" and giving her the Sealed Key, Kero charges her with finding and recapturing all the Clow Cards. With the help of her best friend Tomoyo Daidouji and Kero's guidance, Sakura must learn to balance her new secret duty with everyday troubles as she embarks on her magical adventures as Cardcaptor Sakura.