A sudden disaster swept across the world, the number of humans dropped sharply, and the earth's environment became no longer suitable for survival. However, people still survived in this difficult environment. This day is known as the Ruins' Day in history.
The days that followed were called the Year of the Fall. In the first year of the Fall, the humans who originally lived on the surface were forced to live underground due to radiation and other reasons. They began to use the underground fortifications built by humans before the Fall to re-excavate and form underground cities. The world was divided into three underground cities.
At this point, the three underground cities have been helping each other, surviving and developing together on the ruined earth.
And our heroine Kerry grew up under this situation, uncovering the truth of the doomsday step by step, and protecting her homeland.
Purpose: Protect your homeland and survive the apocalypse