From Tokyopop:

Najaran is a young woman who just happens to be an apprentice Cepter. Cepters have the power to summon creatures from magical cards. Once, these cards were collected in a book called the 'Culdcept.' During an ancient battle, the book was destroyed -- its cards scattered far and wide. Najaran's master gives her a dangerous mission -- she must obtain information about the Black Cepters and their nefarious plans. If the Black Cepters rebuild the Culdcept, the arcane book of ages past will grant them unspeakable God-like powers!