Himari and Himaru, siblings of The Sun Kingdom in the realm of Arazua, love each other with all they have. They are set to rule their kingdom alongside each other with peace and tranquility; the strength of their bond binding them together. However, the entrance of The Iron King brings forth betrayal, heartbreak and a division of bonds between the two. Himari, who secretly harbors an ancient curse that can turn her into a weapon of war, is thrust into an unwanted union. While Himaru's heart rages with the sting of betrayal, and his hatred consumes him. Will fate force the two siblings to work alongside each other once more in order to stop The Iron King from conquering all of Arazua? Or will the bond that was severed remain broken? The only thing that is certain is that the fate of Arazua rests upon their shoulders.