In the world of Cangwu, humans enslave monsters through "beast marks", and their identity is determined by their bloodline. People without the mark of the beast are regarded as waste, while low-level monsters can only be reduced to fighting tools, alchemy materials, or playthings of the powerful.
The girl Ji Xiaomiao was born in the Ji family in a border town. She was born without the mark of the beast and has been ridiculed for sixteen years. During the family awakening ceremony, she was framed by her cousin and fell into the abyss of bones where countless monsters were buried. On the verge of death, a broken black heavenly book awakens from the depths of the demon's bones.
