Shadow Walkers are a strange breed that possess the ability to slip between the planes of reality, becoming immaterial. This allows them to hide in the shadows, either hunting from the concealment of near invisibility or evading enemies. Though they become corporeal to mate or to eat, they spend most of the rest of their lives walking in the shadows. Shadow Walkers are wary creatures, though on dark autumn evenings when the leaves fall to swirl in the chill, rain damp air, they may be seen drifting out from the shadows.

Dragons are highly-intelligent reptilian creatures that—from a human perspective, at least—appear to live forever. Many different varieties of dragon exist, each with their own unique qualities, habitats, and behavior. Adolescence in dragons is usually marked by the growth of a hatchling’s wings, although not all breeds of dragons grow wings and some breeds have other traits that indicate the beginning of maturation. In Galsreim, dragons and humans coexist peacefully.

Will O'Wisp is an unfortunate dragon that suffered much teasing due to his name as a dragonling.  To ensure no other hatchling would suffer as he did, Will entered the Marine Dragon Force to bring wrongdoers to justice.  His current mission is to find and infiltrate Phantom Valley, hometown of the infamous water dragon pirate, Luffy D. Aquahepta.  Being a shadow walker, finding a place called "Phantom" Valley wasn't difficult.  But betraying the happy flock was another story—not the least of which, a certain pretty silver tinsel would probably shun him for the rest of his draconian life!