Heavenly celestial carp Su Yu, spiritual official Pei Yuan, and celestial envoy Yuan Bao accidentally caused trouble, causing thousands of demons to escape. The three were banished to the mortal realm and needed to capture demons to redeem their sins before they could return to their positions. After reincarnation, the three with vastly different backgrounds regrouped, and fortuitously encountered Song Yaoguang, the Jade Pool fairy lotus undergoing her tribulation, teaming up to embark on the path of demon hunting. Along the way, the high-tier demon saint Cang Ming, disguised as a weak boy, joined forces to seek merit. The group worked together to break the wisteria demon, battle the deep-sea dragon demon, and jointly crack all kinds of demon-related crises, achieving mutual redemption and common growth through playful bickering and fighting side by side. As the powerful demon emperor's thunder tribulation manifested, a greater crisis quietly descended, and the group's defying-the-heavens demon hunting journey continues.