I don't know when, some corners of the parallel worlds began to spread and merge. Through these corners, various creatures began to travel across the world, but they all recognized the same delicacy: humans.
The integration of the world is different from the fragmentation of the dimensional wall. There is no love story full of cute girls and royal sisters, only the silent threat of life. The human world has been in darkness since then, with demons and monsters everywhere. Human beings are living on the last breath and suffering unspeakably.
Until one day, after a secret negotiation between human and non-human representatives, a powerful demon who had lived for thousands of years and his human scientific research friends combined human technology and all his demonic powers to develop a system that compels both humans and demons to obey:
Non-humans are not allowed to attack humans under the age of 18,
After humans reach the age of 18, they will be forced to enter the system subworld at certain intervals under the guidance of the subsystem to be hunted by demons, and will be assigned their own guides. The guides are humans who have successfully completed more than ten tasks near the newcomers. Newcomers will go through the first three mandatory tasks under the leadership of the guide to familiarize themselves with the system.
The demon who has exhausted his demon power also injects his consciousness into the system along with the demon power and becomes an artificial intelligence.
Non-humans who understand human literature jokingly refer to this as "a shrewd predator strategy."
Human history has opened a new chapter. In the new version of the history book, the first title about this period of history——
Worlds merge.