In a world where a mysterious power called "Seal Arts" exists, a boy named Ban is born with the worst possible seal, known as the "Seal of Destruction." The Seal of Destruction has no special abilities, except for one—wherever it appears, it inevitably brings ruin. Due to a sinister scheme of a suspicious cult that coveted this power, Ban loses his precious loved ones and is trapped in a distorted space, separated completely from reality. In the depths of despair called destiny, he longs for death, but his burning rage does not allow him to surrender. Sharpening the blade of vengeance, Ban endures the long span of 999 years. At last, he awakens the true destructive power hidden within the Seal of Destruction, breaks through the distorted space, and returns to reality.