Simply put, Mercedes' story is about great strength in the face of hopelessness. As a young fairy princess, the forest kingdom of Ringford is a carefree playground.
But in an instant, the death of the great Queen Elfaria, her mother, at the hands of Demon Lord Odin forces Mercedes to assume the responsibilities of the kingdom on the brink. The newly appointed Fairy Queen must learn her place as a leader by waging war against Ringford's enemies, but then there's the matter of her overly ambitious cousin with his eyes on the throne...
