Savage Age: The Only Man

A cataclysm strikes Earth, sending people into The Savage Age. Liam Clark, tribe leader, gets a D-class job. He activates SSS-class Dragon-Blood Warrior, growing stronger by killing enemies. His Tribe Aura is SSS-class Tenacious Survival. Using the aura, Liam Clark achieves 'firsts', gets rare resources, and enables members to awaken powerful classes. They survive Beast Tides, defeat the Beast King, and earn the right to return to Earth.