Void: No. Nine - 9-banme no Utsuro

Overview

Three hundred years ago, God destroyed the world. All that remains of humanity lives deep underground, far from the blasted surface—and far from The Emissaries, remnant soldiers of the divine war against mankind. Most live quite lives in the tunnel cities, but the few daring or desperate enough to risk death work as scavengers, collecting relics of the old world... (Source: Yen Press)

Source: AniList