Year 9990 of the Calamity Era.
The technological civilization of Blue Star was wiped out long ago, before the calamity.
Now it is the apocalypse!!!
Here, zombies are merely creatures of a lower rank than humans.
Here, monsters, demons, and other creatures rule the land.
In the endless battles,
humanity has mastered various paths of evolution and even used the technology of the past to build fortresses for the apocalypse.
But more and more unknown creatures are growing stronger and smarter!
Faced with hostile creatures numbering in the hundreds of millions, where can humanity turn?
