Tales of Vesperia: The First Strike

In a mythical kingdom, the mighty Imperial Knights harness a magical substance known as Aer to power their weapons and protect humanity from the monsters of the forest. But something strange is afoot. The Aer is somehow changing, causing the wilderness to waste away and stirring the woodland beasts to attack with greater frequency. As danger creeps steadily closer to civilization, two young recruits - Flynn, the rigid son of a fallen hero, and the rebellious and brash Yuri - must ride with their fellow Imperial Knights to distant ruins in hopes of uncovering the truth behind the transforming Aer.

Some will not survive the thrilling journey. Some will be betrayed. If Flynn and Yuri cannot overcome their differences and learn to fight together, all will be lost for the people of the realm.

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Ten years after the Great War against the demon-beasts, the empire rules over the world and prosperity relies on the massive use of aer.
Yuri Lowell and Flynn Scifo are two young men who have just enrolled the ranks of the prestigious Imperial Knights. One day, they are sent to the town of Ceazontania, where abnormal aer activity has reportedly caused the proliferation of horribly mutated beasts, with serious threat for the whole region.
Meanwhile, the Knights Supreme Commander Alexei Denoia and the naive Princess Estellise are involved in a behind-the-curtains struggle for power in the capital. The situation in Ceazontania deteriorates as the garrison of Imperial Knights finds that they cannot expect any immediate support from the capital.
Then, Niren Fedrok, commander of the Imperial Knights in Ceazontania, takes an unexpected decision that is going to change Yuri and Flynn's destiny forever.
What are the secrets behind the extraordinary events that are happening around Yuri and Flynn? Will they be able to defend the innocent people of Ceazontania and stay true to their beliefs?