The Market Festival has come to the city of Housman, where a fabulous blade known as the "Demon Sword" is put up for auction. Recently knighted Cecily Campbell's newest mission is to guard the sword at all costs. There's just one problem: the sword has the mysterious ability to transform into a beautiful woman known as Aria.
Still, it's all fun and games at the festival, and Cecily and Aria become fast friends -- until a huge fire demon appears! The demon will stop at nothing to steal Aria, even if it means reducing the entire city to ashes. Can Cecily and her companion Luke -- the Sacred Blacksmith -- save the citizens of Housman from a rampaging demon and its sinister plans?