Lapis no Shinzou

In a world covered by the gray forest , teeming with ferocious creatures called Mad Demons, a one-eyed young man, Shuou, sets out on a journey to see the world with his own eyes. Arriving in the royal capital of Murakumo, Shuou is introduced by his innkeeper to join the "Royal Army's squires," but quickly finds himself embroiled in trouble… This is where the boundless rags-to-riches fantasy begins.

(Source: Bungeishunjuu, translated)