Amidst a backdrop of social inequality and unrest, the Austrian Empire arranges the marriage of Princess Marie Antoinette to the French Crown Prince to solidify diplomatic ties. Unsettled by her predetermined future, Marie Antoinette encounters Oscar Francois de Jarjayes, the enigmatic Commander of the Royal Guard who was raised as a man despite her inner desire to embrace femininity. While admired by many, Oscar grapples with her identity as she serves the extravagant and detached Queen, witnessing firsthand the suffering of the impoverished populace amidst the opulent spending of the monarchy.