Himari, the princess of the Sun Kingdom in the realm of Arazua, is plagued with an ancient curse that can turn her into a horrifying weapon of destruction against her will and an arranged marriage that causes her distress. Despite it all, she tries her best to exist peacefully for the sake of her kingdom. That is until Rentarou, King of the Iron, enters her life and threatens the existence of her kingdom. Her options: marry the egotistical king or allow her people to perish. Or, perhaps fate has another path in store for her? Will she continue to be bound by duty or will she allow fate to lead her? The only thing certain is that the future of Arazua rests on her shoulders.