Lu Xiaohou, a chuunibyou boy obsessed with cultivating immortality, is reckless and daring. At the very beginning, he ventures into the underworld four times, repeatedly tempering himself through perilous and desperate situations. After accidentally entering a secret realm filled with reclusive masters, he mistakes his surroundings for an illusion. Spirit beasts recognize him as their master, and he subdues divine weapons from across the heavens, roaming freely and stirring up countless troubles. No one knows his origins, but because of him, the Heavenly Dao will initiate a great apotheosis tribulation that reshapes the Three Realms.