Long ago, the emperor"s death set off riots and civil wars that ravaged Atlantia. When the young monarch Yaiba ascended to the throne, traitorous rebels were ruthlessly eliminated in an attempt to restore the peace that had once prevailed. Yet this brutal purge left Atlantia forever cloaked in an oppressive atmosphere, a shadow that still looms over the nation.
Tsurugi Tatewaki is an energetic teenager raised in a countryside, with only vague memories of his parents. One day at home he stumbles upon a blade that, when grasped, transforms into a Battle Spirits card. As the armed forces of Atlantia converge on him with the intent to seize the card, fragments of Tsurugi"s hidden past begin to unravel.
Accompanied by a companion named Bringer, he travels to the capital and encounters warriors wielding swords. The stakes rise as factions vie for the card, and Tsurugi must navigate a web of deception that threatens tear Atlantia apart. As mysteries unfold, Tsurugi is forced to question everything he believes—judgments and line that separates good from evil.