Ye Feng, an ordinary comic artist, searches for his missing grandfather and accidentally enters the Tower of Demon Suppression in the Mountains and Seas, where he obtains an ancient divine brush. With it, he can draw ferocious beasts from the Classic of Mountains and Seas, capture demons, and absorb their power. The fox demon Hu Meiniang stays by his side, while Su Shan of the Demon Suppression Bureau joins him on his journey. Across the seas, countless demons in the Great Wilderness stir, and Zhulong is about to break free from its seal. Turning his art into a blade, Ye Feng wields the power of Kunpeng and the Four Fiends, leads demon slayers in forming the grand Mountains and Seas formation, and suppresses countless calamities with a single stroke, shouldering the burden of humanity's peace with an ordinary mortal's body.