Rhein, a ruined knight hiding in the slums, is secretly the legendary "Sovereign Arbiter". When Selena, the vampire heiress, falls mortally ill, Rhein performs a miraculous healing and walks away without asking for reward. Returning home, he discovers his treacherous former comrade and unfaithful ex-fiancée terrorizing his adoptive mother and bulldozing his house. Enraged, Rhein dons his obsidian-gold armor and crashes their grand wedding to unleash vengeance. Meanwhile, Selena arrives with her entire clan's fortune to propose to him. The hidden sovereign re turns to crush his foes, end ancient feuds, and claim the supreme throne!
