The allegiance of the 5 big kingdoms over the past century, Ashwell Kingdom located at the center and being the biggest and most influential, Thamor Kingdom in the west who boasts of military excellence and revolutionary weapons created, Loseon Kingdom in the north known for their rich agriculture and reign over the mountainous regions, Maicheven Kingdom in the east known for increased trades and mastery in the craft of aerial weapons and transportation such as aeroplanes, and lastly the Richmond Kingdom, a seaside kingdom and the last to join the allegiance with a relatively recent lineage, has made the country of Eclaria successful in almost all aspects, outgrowing the others found within its vicinity.
However, despite the harmonious relationships of these kingdoms, a notorious phantom thief lurks around the whole country with a hidden identity, stealing the most revered artifacts, leaving no kingdom free from his hands. Gems, chests, crowns and scepters from the past generations, he leaves none of the precious artifacts behind. No one knows particularly why the phantom thief commits such crimes, as the stolen artifacts are nowhere to be seen. Recently, the phantom thief has sent a message for Ashwell Kingdom, declaring his plans of stealing a prized possession that they treasure.
While Ashwell is governed by matriarchy, Rose D'elaphontaine Ashwell, only child of the Ashwell family and next in line to the throne, seizes the opportunity to catch the infamous phantom thief and put a stop to his crimes, therefore deeming herself worthy of serving the kingdom in the eyes of her constituents as well as the Queen herself. For the past century, the Ashwells have governed their kingdom this way, with the Queen Regent as the Head of the Kingdom and the King as her General. However, Rose is clueless as to who and what the real phantom thief is capable of, and in her case, what she doesn't know can truly harm her.
As Rose gets closer to the truth, she comes to experience baffling emotions and these foreign feelings cause a stir inside of her. She comes across two dashing men with a recognizable social status and one who has always stood by her side. Because of the phantom thief, her life takes a major 180-degree turn, changing the princess who only knew of proper courtesy, political talks and marriage solely out of convenience. When she finds out the whole truth, will she go according to plan and ascend to the throne with flying colors, or will she risk everything in the name of love?