The 'loser concubine.' Such was the title bestowed upon Nereis.

Beautiful and brimming with talent, Nereis Oudiass, the daughter of a frontier marquis, had dutifully served her fiancé, the Crown Prince. Nevertheless, her engagement was broken off. She was then demanded to fulfill duties as a concubine, not the principal consort, and to hand over all her achievements to the Crown Prince, who had now become King.

This was because her mother was a commoner, and she only possessed half noble blood.

Despite Nereis's valiant efforts to serve her country, a turning point arrived almost a year later.

As a result of winning a certain bet with the King, the beautiful emperor of the neighboring country declared he would take her with himーーー.

*Both the heroine and the hero are married.