Princess Yona lives an ideal life as the only princess of her kingdom. Doted on by her father, the king, and protected by her faithful guard Hak, she cherishes the time spent with the man she loves, Su-won. But everything changes on her 16th birthday when tragedy strikes her family!

Yona returns to her homeland when the Hazara Clan, a powerful family in the nation of Kai, invades the Kingdom of Kohka! How will the Fire Tribe defend against this audacious attack, and what will Yona resort to in order to protect Saika?!