Beneath the Gray Zone

Apocalypse, no System, no special abilities, fighting monsters with nothing but the body, two male leads who are brothers

A sudden, citywide blackout left a massive metropolis completely sealed off. By day, survivors scavenge for supplies in abandoned buildings, neighborhoods, subway stations, and shopping malls, restore power, and clear out the infected. By night, Shadow Hunters, Thunder Howlers, Corpse Climbers, and zombie hordes turn the entire city into a hunting ground.