Fei Peng, a divine general of Heaven, and Chong Lou, the Lord of Demons, have fought so many times and with such matched skill that mutual admiration has grown in place of hatred. When Chong Lou issues a challenge for a definitive final battle, Fei Peng knows accepting would break Heaven's laws — and accepts anyway. The Heavenly Emperor dispatches troops to arrest him mid-fight. Distracted, Fei Peng loses. His sword falls to the human world below. He is banished from Heaven into the mortal realm.
After many reincarnations, Fei Peng is reborn as Jing Tian, a young pawnshop worker in Yuzhou. A chance encounter gives him the Demon Sword, inhabited by the spirit of Long Kui — younger sister of one of his past incarnations. He then meets Tang Xuejian from the prestigious Tang clan and is drawn into the violent conflict between the Tang clan and the Thunderbolt Hall. Later he crosses paths with Xu Changqing, a Mount Shu Sect outcast, and his fiancee Zi Xuan, who are searching for five elemental pearls capable of sealing all evil spirits within the Monster-Locking Tower.