Vesperia is set in the world of Terca Lumireis, which uses an energy source called blastia for all its needs, including creating protective barriers around its cities. The story focuses on Yuri Lowell, a former Imperial soldier who forms a guild called Brave Vesperia to aid Estelle, a noble woman he encounters on a mission. As they explore the world, Brave Vesperia are challenged by factions who have different plans related to the abuse of blastia resources, and Yuri is forced to confront his friend and former comrade Flynn.