Long ago, Earth became unlivable and humanity left for other planets, though that departure turned out to be part of a scheme. Tang Yueliang, a native of Anzhixing, awakens her powers and learns from the Apocalypse, an embodiment of humanity's kindness, that she is the 110th-generation heir of the Demon-Slaying Clan. With the universe sliding into chaos under the Heavenly Entropy, she sets out toward Earth to find the Mythic Crystal, the artifact that can purify it. Along the way she teams up with Sun Dabang, Zhu Lianlian and Sha Benben, each with goals of their own, in a comedic fantasy adventure where every hardship makes them more determined to reach home.