Lux Solis is the sole descendant of the Solarian Royal Family, a matriarchal land ruled over by the queen with the king serving as head of the military. With no siblings to speak of, it falls on Lux to choose the next queen by marriage. However, when he goes into battle for the first time, something happens that will change everything. Someone he once trusted becomes an enemy, and the future of the queendom rests on his shoulders in a way that he never anticipated.