Atlantia had been ravaged by riots and civil wars following the emperor's death many years ago. But with the ascension of young king Yaiba, rebel traitors were executed and peace was restored. However, the authoritarian rule remained, causing Atlantia to linger in the shadows of radical governance. Living in the countryside with vague memories of his parents, Tsurugi Tatewaki is a spirited teen. One day, he stumbles upon a mystical sword that transforms into a Battle Spirits card. Soon, Atlantian forces attempt to take Tsurugi's card, and his mysterious past begins to unravel. Joined by a droid named Bringer, Tsurugi travels to the Atlantian capital and meets fighters wielding similar swords. As Tsurugi's life becomes increasingly complicated by unfolding mysteries, he must rethink his beliefs about good and evil.