Tells of the coexistence of the mortal, demon, and celestial realms. After the ancient demon god Yexiao was sealed for a millennium by nine sword immortals using the Nine Luminaries Demon Sealing Formation, the seal loosens. Lin An, a market boy in Anping Town who makes a living by drawing fake talismans to cheat money, is unexpectedly recognized by Ling Shuang, a cold-faced female swordsman of the Cangwu Sect, as the reincarnation of the fire-type sword immortal Fenyang, and the rusted broken sword at his waist, "Slashing Evil", is precisely the demon-sealing divine artifact. The half-demon girl Xiao Yao, because her blood can unseal the demon lord, is hunted down by the Blood Shadow protector, and is saved by Lin An. The three of them, joining forces with the mountain-guarding boy Tie Niu, embark on the path to find the three divine artifacts—the Tianshu Seal, the Dixuan Bead, and the Renji Bell—and recast the Nine Luminaries Demon Sealing Formation.