The Eternal Night Demon Emperor Lu Qingan lived in seclusion for a thousand years for his wife Xu Qingying, but was forced to divorce because her attaining the Dao as the Immaculate Female Emperor required severing mortal ties. Binding with the system, after divorcing he unlocks a million-fold cultivation amplification and returns to the Demon Realm with his two daughters. Reclaiming his identity as the Demon Emperor, he subdues old subordinates, gathers supreme treasures, crafts peerless divine weapons for his daughters, and rebuilds their home in the Demon Realm. Facing pursuit from the Immortal Ruins, the dangers of the Demon Realm, and various entanglements of affection, Lu Qingan protects his daughters forward with an invincible posture, settling past grievances while continuing a brand-new legend belonging to the Demon Emperor.