Cardcaptors

The Dragon Slayer (1x31)

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Naoko, Sakura's classmate, and a friend go to a bookstore and buys a mysterious book that has no title. Sakura catches the Big Card, only for her and her friends to encounter strange phenomena. Kero suggests the Create Card, Naoko's book, is responsible. Everything Naoko writes materializes in the real world, culminating in a dragon appearing. Sakura uses the Big Cards to become a giant, wrestling the dragon. It begins to vanish, Naoko having stopped writing, but Kero tells her to capture the dragon, as it will seal the Create Card too.