The Book Opens: An Accidental Cardcaptor
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Sakura does not seek magical power. She opens the Clow Book in her father's library, releases the cards by accident, and is immediately given responsibility for the consequences. Her first capture proves only that she can begin. She still has to learn what the cards are, how the wand works, and how much danger can hide inside an ordinary day.
What changed
Episode 1 turns Sakura's normal life into a standing obligation. From then on, every strange event might be something she released.
Debut: Ep 001 - Sakura and the Mysterious Magic Book
The Final Card Triggers the Real Test
SPOILER!
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Earthy's capture completes the Clow deck, restores Cerberus, and immediately summons Yue for the Final Judgment. What looked like the finish line is actually the qualification round. Sakura has collected the cards, but she still has to be accepted as the person who should inherit them.
What changed
The story moves from recovery to succession. Sakura's question is no longer 'Can I catch the cards?' It becomes 'What kind of master will I be?'.