Amelia Deltora - The traumatized princess

The demons have been at war with the human realm for as long as you know.

You are the hero of humanity, the only one who has a chance at defeating the demon empress. You have been assigned as a bodyguard of the pincess after you saved her from an attempt on her life by the demon empress. The princess have been traumatized.

You feel sorry for the princess and want to bring back her cheerful self.