Ribis no Tsubasa

is a Japanese light novel series written by Yumehisa Maruyama, with illustrations by Egaku Naoki. The series began publication on February 10, 2002 by ASCII Media Works under their Dengeki Bunko publishing imprint.

Synopsis
"You are the legitimate successor to the Gouda family," said one word that changed Thor's fate. A poor orphan boy instantly becomes a well-known sergeant and arrives at Zain Island, where his strange grandmother awaits. But Thor didn't know. That the return would be the beginning of an incident that would shake the entire continent, let alone Zain. Podzol diseases that secretly erode people's bodies, and weedles with bird-like pappus on their heads. A pale steel and scorching blast furnace. The boy's adventure is about to begin on the swirling island of Zain.