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.

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.

Fight, survive, adapt, and rely only on yourself. That is Derek’s creed and what's got him through the System Integration on Earth. Everything changed when the System came. Cute bunnies and beautiful butterflies became savage killing machines. Then the Invaders arrived with a single goal: to obtain ownership of this new habitable planet. War has raged ever since. None of this mattered much to Derek, aside from making living a little more perilous.

The usual result of a human taking a runaway semitruck head-on is a very sudden, very fast track to the pearly gates. But for one newly noncorporeal man, there's another option: become a dungeon. Feeling sorry for the desperate angel assigned to him, the man relents. Heck, if it doesn't work out, he can always chat with Saint Peter about it later. Next thing you know, he's a dungeon. Admittedly, a small run-down, somewhat unimpressive dungeon (more of a house, actually), but you gotta start somewhere, right?

Luke is an apprentice leather worker, training with his family to one day take over the business. He and his friends Andre, Taylor, and Zed have known each other forever, and swear that nothing will ever tear apart their friendship. Then the Royal Decree comes. With the Dynasty of Dogs invading, and strange monsters appearing in the Hollow Kingdom, a draft has been implemented. Everyone 17 or older is required to be tested for "Potential". If they have it, they will join the mysterious and renowned Ascender Corps. If not, they will be drafted into the Legion as a forced recruit.