The Mo clan has protected the Monster Fusion Vessel for generations — an ancient artifact capable of sealing away demons. Young Fu Zixun descends from the mountains after his clan is destroyed, the Vessel stolen, and his benefactor killed. He travels with his benefactor's daughter, and along the way they gather an unlikely group of companions: a rich young woman who left her comfortable home to join bandits, a respected transport escort leader, a thief known as Flying on Grass, a legendary swordsman, a fox spirit from a hidden valley, and a young man who grew up entirely alone. Each of them carries grief, anger, or some private wound. Together they oppose demons causing chaos across the land and corrupt officials oppressing ordinary people — holding onto a belief in a better world even when the next step forward is unclear. The meaning of the Xuan-Yuan Sword, and what the journey has built toward, eventually becomes clear.