Void: No. Nine - 9-banme no Utsuro

Centuries after humanity ripped a vengeful god from the heavens, Reclamation City No. 9 stands atop the barren world that remains. Below, a network of tunnels is a chance for the most desperate and deranged to strike it rich scavenging—if they can make it back alive. For the vestiges of a dead god cling to life, bathed in the shadows of ancient halls. Impelled by avarice, circumstance, or something more sinister, nine strangers make the descent. But in the darkness that awaits, it's anyone's guess where the greater danger lurks: in the unhallowed maze ahead, or with those who walked into hell alongside them...

(Source: Yen Press)