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In the prosperous city-state of Crownia, a mysterious force governs the underworld through four Kings: Spades, Diamonds, Hearts, and Clubs. Each sovereign commands a magical deck that grants special abilities to their allies, maintaining a fragile balance of power. But when Federico, the King of Clubs, suddenly dies in an accident, that balance shatters. His authority-thought to have vanished-passes to Sylvia, a university student far removed from that world.