A distinguished warrior brings home a slave from the island of gold to his Imperial Palace. The slave's combat expertise quickly gain her the prestige of becoming one of the Swordmaidens of the Princess herself, and she quickly becomes the Princess' best friend. When the Emperor is assassinated, the Princess must become the Empress, against the interests of her political enemies. The Swordmaiden must now protect her Queen against threats they never expected. Love comes at a price, especially one as forbidden as the love between a Sun Tiger and a Moon Serpent.