Oxygen Era

A solar storm swept across the earth, pushing the world into an "oxygen erosion era" in which oxygen concentration surged. The giant and violent Zerg replaced humans and became the masters of the earth. A hundred years later, the remaining civilization could only huddle underground and survive. And when the first "half-human, half-worm" who is tempered by insect blood and solar storms but miraculously maintains human consciousness is born, the doomsday truth and the key to evolution that have been buried for hundreds of years will finally be revealed.