In a distant world five times the size of planet Earth, dungeons and their dungeon cores have become the top of the food chain.Millions of dungeons inhabit the planet, utilizing the various human kingdoms as a source of much-needed mana to facilitate their own growth; in turn, the humans delve into the dungeons and acquire their own power in the form of Essence, which allows them to develop and enhance themselves in a multitude of different ways. It is a symbiotic relationship that has lasted centuries and has brought about a measure of peace.Far in the northern wilds where no humans (and therefore – no dungeons) regularly frequent, a young man is left alone when his parents are murdered suddenly and unexpectedly. Now, without friends, family, or even supplies, he embarks on a journey to find out who targeted his parents – and who he needs to enact his revenge upon. Along the way, he discovers something about himself that his parents said was impossible from the moment he was born.Will he learn to control the new powers he has gained, or will his newly awakened dungeon core abilities consume him?

Eddie Hunter is about at the end of his rope, so when he stumbles across an ad looking for people to farm in Long Term Immersion in the game Light Online, he can't believe his luck. Once hired he enters the game as soon as he can. Unbeknownst to him, though, the person that hired him is also doing illicit research on the pods that he and the other farmers are using. The research is rapidly discovered by the AIs that monitor the game and shut down, forcefully, by the company that runs Light Online. But the code that runs those pods has been altered, and until it's fixed Eddie and the others can't log out. Although the devs assure him that it won't take long to fix, Eddie's not so sure of that himself. Eddie entered the game to make money in real life, and as he tries to do that he finds himself getting entangled deeper and deeper in the game and with the people he meets there. But when he discovers a side of the game that the previous players had apparently never even considered, he knows he has to find a way to stay in the game.