Princess Diana, fleeing a forced political marriage, is captured and sold at a slave auction, only to be rescued by a skilled young warrior named Sho. As they travel together, Diana finds solace in Sho, adopting the name "Dee" and pledging her loyalty to him. It is revealed that the two share a tragic past, and Sho is granted the prestigious Crest of the Children of the Wind, giving him command over twelve nomadic clans as he pursues a mysterious goal.
As Prince Dunan obsessively hunts for the missing Princess Diana, Sho struggles with his conflicting feelings of revenge and affection for the woman he holds as his slave. After Diana is captured and tormented by the sadistic Dunan, Sho intervenes, leading to a climactic confrontation where Diana finally seizes her freedom. In the aftermath, the sovereignty of Doria is transferred to the nomads to ensure peace, and Diana chooses to remain by Sho's side, bound by a new, deeper devotion.
Sho and Diana encounter the arrogant Patris, who attempts to buy Diana but is rebuffed by Sho's unwavering devotion. To humble the spoiled heiress, her uncle hires Sho as her guardian, leading Patris to eventually fall for him and beg for servitude. In a final twist, Sho sells Patris to Kyle for a single copper coin, stripping her of her pride while securing her future, before resuming his journey with Diana.
While King Gauss of Gupta plots to dominate Doria economically and searches for the missing Prince Dunan, a daring political scheme unfolds in the city of Saas. To protect the kingdom and outmaneuver their rivals, the royal adviser Imil orchestrates a fake abdication of King Teo, installing Sho as the new King. With Ulsra impersonating Princess Diana to deceive a Gupta envoy, Sho hopes to use this strategic deception to gain leverage and uncover the truth about Dunan's disappearance.
King Sho and Queen Diana visit the kingdom of Gupta, where Sho orchestrates a massive military siege to force a peaceful surrender and secure a strategic treaty. Amidst the political maneuvering, Sho helps Prince Marlon find love with his attendant, Hanna, before returning home with Diana. Their journey cements Diana's legendary status as the "Slave-Queen," a symbol of devotion and strength admired by women across the world.