On a giant flat pancontinent surrounded by endless canopies and mosaic stars (with creatures inhabiting both sides), humans have built a near-future cyberpunk society where five empires stand side by side - technology is advanced, the entertainment industry is extremely prosperous, and it looks prosperous on the surface.
However, there is a fatal crisis hidden under this prosperity: extraterrestrial demons have already penetrated the upper echelons of mankind through desire parasitism and transformed the entire world into a "demon breeding ground." Normal humans have become a breeding ground for inner demons since birth. When the inner demons mature, they will replace the original owner's identity, leading to the slow and unknowing demise of the human race, and the world is shrouded in falsehood and madness.
The only hope comes from the group of "Inner Demon Controllers" - they have awakened the spiritual apostles and are able to fight against the demons, but they will still become the hunting targets of the demons themselves.
The fate of young Xue Cai was completely rewritten on the night when he came of age: he unexpectedly discovered that his best friend was actually a hidden demon. This cruel truth unveiled the prelude to his adventure to fight against the demon and protect the survival of mankind...
