Plot Summary: One day, Kinomoto Sakura, a 4th grader stumbles upon the mysterious book of Clow. Upon opening it and reading the name of The Windy aloud, Sakura scatters the cards to the winds. Sakura is elected and appointed by Keroberos, Guardian of the Cards to capture the remaining cards. With her friend Tomoyo and rival Syaoran, Sakura begins an adventure that will forever change her.
In terms of the mahou shoujo approach to the series, the first two seasons feature a 'monster of the week' approach typical of the genre where Sakura has to confront one of the Clow Cards to capture it during one of her typical days. The behavior of these cards with Sakura can vary from being friendly, mischievous, or doing whatever possible to harm Sakura. Sakura then has to do what she can to immobilize the card and capture it. She can either use the environment around her to her advantage to capture the card or using any of the Clow Cards in her possession to capture a card. In the third season, these battles change over to challenges set up by Eriol.