In the seventh century of the Central Plains Continent, the demon King Zaohao recruited many believers, infiltrated his power into the nine major kingdoms of the Central Plains Continent, and launched a war that swept the nine countries. Unexpectedly, he was defeated by the coalition of kings of the nine kingdoms. The demon sword was forged from the leg bones, hair from the corpse of an unknown ancient god, gold and iron from the South China Sea, and seven mysterious gems, and led the undead army that had been dormant for five hundred years to re-enter the Central Plains. Although the final outcome was that the demon was defeated, the magic sword was damaged and its whereabouts were unknown, the nine great kingdoms of the Central Plains barely won the war with all their kings killed in the battle.
Nine hundred years later, in the 21st century of the Central Plains, Ji Xing'er, a wandering thief from the Daughter Kingdom, accidentally stole a special necklace from Sister-in-law A Qing. Looking at the dark green gem on the necklace, she didn't know that a bloody storm that would shake the nine kingdoms was about to come. On the road of adventure, although she met her friends, she also experienced the pursuit of the devil.