About a century ago, “Divine Tribulation” invaded reality, unleashing countless demons, monsters, and magical beasts. Humanity was forced into a survival system of “Awakening → Class Advancement → Killing Monsters and Leveling Up.” Death has no universal resurrection system. Only a very small number of healing-class specialists possess the limited ability to keep people alive on the battlefield. The calamity also progresses alongside the release of “expansions.” The preview for the third expansion announces that, ten years later, [Demon God Revival] will arrive. The strongest warriors are ranked by the number of times they have advanced their classes, while the highest-level guardians are known as “Celestial Venerables.” Yet humanity as a whole still suffers from a severe shortage of high-level experts.