The Golden Age of Aviation on Prester is characterized by vanship, retro-futuristic sky vehicles that dominate the horizon. Fearless racing duo Claus Valca and Lavie strive to become the first sky couriers to cross the Grand Stream, but their journey takes an unexpected turn when they encounter Alvis, a mysterious girl, and become entangled in a centuries-old conflict between Anatoray and Disith.

Tatiana searches for Disith ships in her Vanship, while Claus and Lavie prepa...