Kingdom of the Storms: The Lost Princess

For dozens of years, humans and dragons in Ascalon have been at war. The dragons believed the humans had lust for power and spoiled the nature. The humans believed the dragons were liars who hid at their mountains and never cared about other people. Whatever their thoughts were, however, neither of them knew they had the hidden common enemy: the demons of the Underworld.
Nowadays, the last King of The Dragons dies. His only child, the Dragon Princess, is believed to be lost forever. At the same time, the human king, Renkor, also disappears. When he returns, he's not what he used to be. Before his expedition to The North, the entrance to Underworld, he cared about the people and was determined to save the humanity by rescuing the High Wizard Aevel. Now, though, he's suddenly become a tyrant who rules his kingdom by the iron hand. The dragons believe he's cursed for killing their king and their heir, but one boy knows the truth: Undaunted, the servant at Renkor's castle.
Unbeknownst to himself, one day, Undaunted, his sister, Clementine, and the human prince Gareth discover no other but The Dragon Princess herself, revealing the truth. Now, their life has become a journey and one of the most important missions in history: to help the dragons' heir to get back to home and stop the war. And they need to fulfill it - whatever it takes...