Nine Abyss Demonheart is an epic work of Eastern fantasy. It tells the story of Lin Fan, an ordinary youth who accidentally awakens the primordial evil dwelling within him: the Nine Abyss Demonheart. From then on, he is swept into a cataclysmic conflict spanning the human, demon, and devil realms. Bearing a demonic seed capable of destroying the world yet possessing a kind heart, he struggles to survive between the righteous path's pursuit, the demonic path's covetousness, and the backlash of his own power.
Along the way, he meets A Man, the Sword Venerable's daughter, whose origins are shrouded in mystery and whose mind has yet to awaken; Ye Yaoyao, a bewitching and cunning Nine-Tailed Sky Fox who is both rival and ally; and Liuli, a cold and aloof fairy from the Liuli Pure Land whose loyalties are uncertain. Together, they endure life-and-death trials. From a remote frontier town to the Netherworld Caverns, from the Valley of Ten Thousand Demons to the Liuli Pure Land, Lin Fan gradually uncovers the astonishing connection between the Nine Abyss Demonheart and the ancient Sword Venerable Jiyuan, along with startling secrets hidden in his own bloodline.
Blending fiery battles, mysterious investigations, humorous everyday moments, and bonds that cut to the bone, the story follows Lin Fan as he strives to protect those he loves and defy fate, balancing the ultimate evil within him against the righteous path in his heart. In the end, he rewrites his destiny and embarks on a legendary path of proving the Dao through his demonic heart, slaying gods, and destroying immortals.