I Open a Navigation App in the Apocalypse

In an underground apocalypse where the depths seem bottomless, countless human settlements are scattered at different levels below the surface. Vein-like tunnels connect them, but countless monsters and constantly shifting passageways keep humanity divided and isolated.

There is a group of people who control special vehicles and brave the perilous tunnels, carrying supplies and information back and forth. They are humanity’s most precious lifeblood on the move.

For this, they are honored as Couriers.