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.

Nathaniel's bus ride was supposed to be just another boring commute. Wrong. Now, he, 23 fellow passengers, and a corgi named Biscuit, are stuck in a "Hell Difficulty" Tutorial, battling monsters and leveling up to survive. Easy difficulty, anyone can handle. Normal difficulty, you've got to put up a fight to get by. Hard difficulty is where only the tough ones last. And Hell? That's where you have to be a bit out of your mind! With his terrifying talent for mana manipulation, Nathaniel decides to invest every stat point into mana.

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.

When Alice Verianna went to sleep, she was just another teen from the Denver suburbs. She definitely didn't expect to be transported to a magical alternate dimension, inhabited by monsters and presided over by a mysterious System. Here, people resemble RPG characters and everyone has access to their own status screens. Grappling with the mechanics of the elusive System isn't the only challenge Alice faces. It seems an underground organization known as the Society of Starry Eyes has taken a particular interest in other dimensions.