That June afternoon, the sky split open.
The domain descended, God appeared, and a city was reduced to ruins in thirty-one seconds. Three hundred and twenty-seven people died and one survived.
Gu Chuan, an ordinary high school student, is the "only one". Under the ruins, a dying demon entrusted his power to him, while leaving an unclear message: "Don't believe them."
From that day on, Gu Chuan's world began to collapse.
He learned that his parents did not die in an experimental accident, but were "taken away"; he discovered that a domain energy that did not belong to humans was awakened in his body; he gradually realized that all creatures on this blue star - including humans themselves - are just experimental samples of a higher existence.
And that "angel" is the reaper.
Gu Chuan vowed to find out the truth and find his missing parents. But the deeper he went, the more he discovered a terrifying fact: the domain has existed for thousands of years, and the development, war, and evolution of human civilization are all controlled by a pair of invisible hands.
Now, these hands are finally picking fruits.
Accompanying him are the heroine Lin Yin, who has a cold and vicious tongue but hides a deep secret, a monitor whose origin is a mystery, a mysterious organization that is both good and evil, and an alliance of domain warriors known as "the last line of defense for mankind."
But when the truth was revealed bit by bit, Gu Chuan had to face a problem——
If human beings are really captive experimental subjects, then after gaining the power of demons, is he still a human being?
This is a story about struggle, growth and resistance. Caught between gods and demons, a group of teenagers decided to overturn the chessboard.