The decision to start a new life is never an easy one, but for Joe the transition was far from figurative. Becoming a permanent addition to a game world, it doesn't take long to learn that people with his abilities are actively hunted. In fact, if the wrong people gained knowledge of what he was capable of, assassins would appear in droves.

As a martial arts instructor, Nori has always had a simple purpose in life: Help underprivileged kids build confidence and self-discipline. Now she'll have to do so for everyone else, too. It all started with a mist, one that gave everyone stats and levels, but also disabled technology and transformed animals and humans into cybernetic horrors that preyed on the living. Within months of its inception, civilization had crumbled.

For eons, conquering dungeons has been the most efficient way to become a strong adventurer. Although not everything is as straightforward as it seems. Several questions have always plagued the minds of those who enter these mythical places of power: why are there so many monsters? Where do the amazing weaponry and heavy gold coins come from? Why does the very air fill with life-giving energies? Cal has all of the answers to these age-old questions, for a very simple reason. He is a Dungeon Heart.

Monsters and beasts roamed the earth and were slain by soldiers and adventurers who were, in turn, killed by stronger threats. Heroes and villains created new epics and were forgotten when their successors appeared. This was the way of the Infinite World. Summoned into this chaotic place, a young boy with no name and no past must learn to survive. Bound to a master who doesn't care whether he lives or dies, he must become stronger. The question is: how?

Felix's life on Earth had become a series of dead-end jobs, ruined relationships, and rotating apartments smaller than most postage stamps. By all accounts, even his own, he was a coward. Too afraid to move forward, to take risks. Yet when given the chance to choose between risking his life or walking away from a deadly encounter, he didn't hesitate. Moments before his untimely demise, Felix was snatched from earth and thrust into a magical world known only as "The Continent". Empowered by the "System", he learns that he can strengthen himself through combat and dedication.