Two young boys living in the Wahrheit Empire are planning to relocate to the capital city: the shy Inumael who works as a transporter and cares of his beloved younger sister, and Leocadio, a naive new soldier of the Empire who spent his days in the imperial city thinking of his future as a soldier.

In the Empire, countless human beings were once extinguished from the world. The return of the “light,” the calamity that summoned brutal demons into the world, is predicted, and the remaining humans’ spirits are devastated. Meanwhile, the fate of Inumael, Leocadio, and the history of the Empire will change drastically as a result of a smuggling incident.