Doomsday Fortress Rule the Wasteland

When the Z-Virus wipes out humanity, retired mercenary Arthur is brutally betrayed by his fiancé and best friend, thrown into a zombie horde to die. On the brink of death, he awakens the [Ultimate Doomsday Fortress System]. He instantly massacres the undead and transforms a ruined apartment into an impenetrable safe haven, armed with automated Gatling turrets and infinite supplies. When his betrayers crawl back, begging for mercy outside his titanium gates, Arthur answers with a cold smile and a ruthless bullet. But the apocalypse has just begun. As mutants evolve and ruthless mercenary armies attack, the true mastermind—the floating utopian "Eden City"—launches an orbital strike and sends a 50,000-strong mecha army to wipe Arthur out. In response, Arthur pushes his fortress to the limit. He fuses with a primordial S-Class Dragon, donning a demonic biological mecha. Single-handedly, Arthur slaughters his way into the sky, rips apart the false god of Eden City with his bare hands, and claims the flying utopia as his ultimate Doomsday Fortress, becoming the one true king of the wasteland!