Lamia Orphe is Dead

One female knight, two princes. Despite having been trained to be the next duchess, Lamia Orphe decides to become a knight. Meanwhile, the first prince of the Kingdom, Ethan Taylor, and the second prince, Aquilla Theodore, are engaged in a battle of the throne. Why does Lamia keep waking up crying? How could her fate, both present and past, be intertwined with the two princes?