Ancient sword immortal Chen Shuai, in order to find his beloved wife who fell while undergoing her tribulation, resolutely gives up the fruit of immortality, carries his memories into reincarnation, and is reborn in an apocalyptic era overrun by giant beasts. From a laughed-at "talentless good-for-nothing" to a legendary general who slays a Seven-Star Beast Emperor with one sword strike and awes the Alliance, he sweeps through beast tides with his immortal sword, but uncovers the alien colonization conspiracy behind the eighty-year calamity. To protect his beloved and all living beings, he summons heavenly lightning and perishes together with the enemy. Three years later, as an interstellar fleet bears down, he actually awakens in the wasteland in an alien body, and the cycle of fate begins again.