Edge of Pure Land

"The Chronicles of Earth" records: In December 2534, Lu Buer, afflicted with a terminal illness, privately tampered with forbidden power. By studying the life structure of the Otherghosts, he utilized his own condition to develop the ability to devour them. This act abandoned the dignity of being human, and he became an enemy of all! In August 2535, tragedy struck the world as the demon was crowned king. In May 2536, sorrowful news arrived: the rebellious monarch Lu Buer was advancing toward the City of God! In July 2537, a warm welcome to the great fourth-generation Sacred Monarch as he arrived at his loyal City of God! [Not a post-apocalyptic wasteland story]