In Prester, a world where flight reigns supreme thanks to Claudia Fluid, a liquid derived from crystals unique to the planet, the Guild holds sway over the skies with its control of engine technology fueled by this substance. Amidst the turmoil plaguing Anatoray and Disith due to environmental crises, the Guild not only regulates the use of Claudia Fluid but also meddles in the ongoing conflicts between the warring nations. Within this volatile backdrop, Sky Couriers navigate the skies in nimble vanships, evading the clutches of the Guild. Last Exile chronicles the journey of Claus Valca, the son of a renowned vanship pilot, and his loyal friend and navigator Lavie Head. As they aspire to outshine their parents, their routine courier missions involve traversing the treacherous Grand Stream, a turbulent aerial current dividing the feuding territories. Their lives take a dramatic turn when they agree to transport a mysterious orphan, Alvis Hamilton, to the enigmatic battleship Silvana, plunging them into a dangerous game where they challenge the Guild's supremacy and find themselves embroiled in a larger conflict of epic proportions.