Hell's princess

"Your Highness, Asmodeus. An unusual delivery was made this morning from the Kingdom of Onardolia. A young knight came and gave me a crate with the kingdoms crest."
Yuki Onna, the queen stepped forward and lifted the lid of the crate. Inside was unmistakably Princess Aviana, the sole heir to the Onardolia crown slept soundly, clutching and envelope, coal black. After reading the note, King Asmodeus stated, "As long as Avianna is in my custody, we shall raise her as a princess to both Onardolia and Hell.
Princess Avianna, age five was sent away to the kingdom of hell, by her own parents as a plot to wage war on them as well as find a worthy suitor for the princess. And plan to say she was kidnapped and used as a slave, but little do they know, she has been treated, like a princess and had grown attached to the kingdom of hell, and a distaste for her home town.