In the year 2325, amid a brutal global war between world powerful countries, the isolated nation of Elysara secretly developed a bioweapon called "Eternal Veil" project “doomsday”in an underground lab beneath the capital. Designed to turn enemy soldiers into mindless, strong drones, the experiment spirals out of control during a test run, unleashing a mutagenic virus that transforms most of the population into ravenous zombies. Arthur Kane, a 16-year-old orphan,a curious young mind, whose parents died, when he was 10,he has been living in a basement, pickpocketing for survival,was suddenly woken up from his sleep by siren blaring.Only for him to find out what had happened.As the world above descends into chaos, Arthur emerges to find his city overrun by the undead, with pockets of survivors fighting for scraps. He allies with a ragtag group of survivors: a soldier who worked at the underground lab, his daughter, and a street-smart hacker kid. Together, they navigate zombie-infested wastelands, evade military remnants enforcing quarantines, and race to find a rumored antidote hidden in a distant outpost.