Story of CardCaptor Sakura

Cardcaptor Sakura takes place in the fictional city of Tomoeda. Ten-year-old fourth grader Sakura Kinomoto opens a mysterious book in her family's basement and accidentally releases the magical Clow Cards from a book created and named after the sorcerer Clow Reed. By her ability to open the seal, Sakura is revealed to have special powers. The guardian of the cards, Cerberus, emerges from the book and chooses Sakura to retrieve the missing cards. The task involves finding each card, battling its magical personification, and sealing. Each card has its own unique ability and can assume an alternate form when activated. As she finds each card, she battles its magical personification and defeats it by sealing it away. 

Cerberus acts as her guide, while her best friend and second cousin, Tomoyo Daidouji films her exploits and provides her with battle costumes. Sakura's older brother Toya Kinomoto watches over her, while pretending that he is unaware of what is going on.Syaoran Li, a boy Sakura's age and descendant of Clow Reed, arrives from Hong Kong to recapture the cards himself. While initially antagonistic, he comes to respect Sakura and begins aiding her to capture the cards. Once Sakura captures all of the cards, she is tested by Yue, the cards' second guardian, to determine if she is worthy of becoming the cards' true master; Yue is also the true form of Yukito Tsukishiro, Toya's best friend. Aided by her teacher Kaho Mizuki, Sakura passes the test and becomes the new master of the Clow Cards. 

Eriol Hiiragizawa, a transfer student from England, arrives in Tomoeda and begins causing disturbances with two guardian-like creatures, Spinel Sun and Ruby Moon. Suddenly unable to use the Clow Cards, Sakura transforms her wand and begins the process of transforming the cards into Sakura Cards. Once all the cards have been transformed, Eriol tells Sakura that he aided her in converting the cards so they would not lose their magic powers. Syaoran later confesses his love to Sakura, who comes to realize she also loves him. Cardcaptor Sakura concludes with Syaoran returning to Hong Kong with a promise to return. Two years later, Syaoran moves back to Tomoeda permanently.