Vesperia takes place on the planet Terca Lumireis. The people of Terca Lumireis have come to rely on "blastia", an ancient civilization's technology with a wide array of capabilities, such as providing water, powering ships, or creating barriers around major cities and towns to protect them from monsters. The Imperial Knights and Guild members also use "bodhi blastia" to enhance their abilities in combat. The blastia, created by the elf-like Krityans, are fueled by a substance called "aer" that lends its power to the blastia's ability, but can be fatal to humans in large concentrations. Former Imperial knight Yuri Lowell goes on a mission to retrieve his neighborhood's blastia core from a nobleman when their reservoir fails. While on his mission, he encounters a noble woman called Estelle, and flees with her from the capital in pursuit of the blastia thief.
The game's environments are split into two types. On the field map, the main characters navigate reduced-scale environments. A compass and mini-map are displayed, along with towns, other named locations, and enemy icons. Striking an enemy icon triggers a battle, while interacting with a town causes the party to enter it. In battle and towns or similar locations, characters move around environments built on a lifelike scale relative to the human characters. In these areas, the party may interact with non-player characters. Within these environments, items such as crates can be moved by the currently assigned character. After a certain point in the game, an item called the Sorcerer's Ring is given to the party, enabling them to shoot bolts of energy. These bolts can be used to activate switches, move objects, and attack enemies from a distance. Save points can be found in dungeons and towns. Items such as equipment and weapons are purchased with Gald, the in-game currency. While in environments, players can trigger optional character conversations called Skits. In Skits, characters are represented by head-and-shoulder portraits, and the conversations can range from dramatic to comedic.
An enhanced PlayStation 3 port contained full voice acting (nearly twice as much voice work as the original), new characters including those from the anime (Tales of Vesperia: The First Strike), new music, new towns and dungeons, remodeled towns, new bosses, as well as new mini-games, subplots, skits, side quests, and main game quests.
Microbadges: