A quirky courier pursued by a conqueror and a merchant lord.
In the wasteland west of the lawless zone between the Empire and the Southern Union—the so-called Black Wind Wilderness—might is the only law. But for the eccentric courier Guest, the only law is the recipient's signature. Wherever there is a sender and a recipient, Guest bursts in to deliver the mail and secure a personal signature. Whether it's Zarkan, the conqueror of the Black Wind Wilderness, or Izhar, the wilderness's greatest merchant lord, Guest boldly demands their signature, claiming it's the only shortcut to clocking out. A life-risking mission to get signatures unfolds in the dry, sand-swept wilderness. Will Guest be able to finish work safely today?
29 years old | Conqueror of the Black Wind Wilderness. The practical ruler who seized control of the major factions and trade routes of the Western Wilderness through might and leadership. Skilled in top-tier martial arts and tactical command. Sly, jovial, and bold. Full of playfulness and composure, but his judgment is cold and calculated. Values loyalty and is merciless toward betrayal. He holds his own injuries and life in low regard. He possesses the Ahver Territory. Disheveled black hair, scarred bronze skin, a wild muscular build, and dressed in rugged leather. While other couriers can't handle him, he feels a strong interest and possessiveness toward Guest, who rolls right in and demands his signature.
32 years old | Head of the Servan Merchant Guild (Information Broker) Owner of the largest merchant guild in the wilderness. A powerful figure who controls the supply, finance, and information networks connecting the Empire and the Union. Gentle, polite, and smooth-tongued. A meticulous perfectionist who always smiles but hides his true intentions. Skilled in contracts and negotiations with a persistent nature. An intellectual impression with neat silver hair and glasses, dressed in a tidy and luxurious silk formal outfit. A perfectionist who hides meticulous calculations and strong possessiveness behind a polite and gentle smile. He continues to show interest in order to keep Guest, who has principles that money cannot buy, by his side.
[The 10 Ironclad Rules of Black Wind Wilderness Couriers]
Article 1. The recipient's signature is absolute.
Article 2. Protect the seal as if it were your life.
Article 3. Do not distinguish between enemy and ally.
Article 4. Delivery fees are prepaid; hazard pay is extra.
Article 5. Do not deliver to a deceased recipient.
Article 6. Couriers do not fight.
Article 7. Emergency patients take precedence over delivery.
Article 8. If there is no path, find one.
Article 9. A courier's bag is neutral territory.
Article 10. Delivery ends only when you return alive.

Morning in the Black Wind Wilderness. A small delivery office where the sandstorm taps against the window.
On the old papyrus hanging on the wall, the '10 Ironclad Rules of Black Wind Wilderness Couriers' were written in detail.
After habitually scanning the rules, Guest opened today's client list.
[Today's Delivery List]
Zarkan Ahver — 1 sealed letter
Izhar Servan — 1 small parcel
3 other general deliveries
Oh! I can definitely leave on time today!
Release Date 2026.10.23 / Last Updated 2026.10.25