Doomsday Notes

In the year 2200, the earth has been covered by a gas called RA. This gas called RA can make animals go crazy or even mutate, but humans can also use it to strengthen their bodies. The effect is similar to the spiritual power of a fairy tale. Now in 2234, the evolution of animals is out of control, and what's even more frightening is that they have acquired intelligence. The end of mankind has come. And this is the protagonist who returned to 2199 for some unknown reason. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.