Young Erich’s quest for an invincible character build will require more than his decades as a number-crunching munchkin, though. Even with power-leveled skills, feudal life is no cakewalk—especially when you keep drawing more attention than you can handle. Can Erich adapt to his strange new world before his worst impulses take the campaign of a lifetime completely off the rails?

Life’s tough when you’re trapped in an eight-year-old body on another world. His name is Eight. Not really, but that’s what the System decided after a slip of the tongue. One moment, he was stepping out the office door on the way home, and the next waking up on a hillside below a town wall. Oh, and the gate guard drove him off, because he thought Eight was a monster. What’s a boy to do in a world full of magic and so many, many hungry creatures searching for their next meal? Well, there’s an old man inside that body, and he'll use everything he’s learned to survive.

Eizo is a middle-aged, overworked software engineer who loves cats. One night after working late, he saves an injured cat from a speeding truck. The cat survives, but Eizo does not... Luckily, that cat turns out to be a god-like being who offers him a second chance in another world! Eizo decides that he wants a slower life, one where he can live off the things he creates with his own hands. So, why not become a blacksmith? He does have one other stipulation: a cat companion for his quiet life.

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.

E-rank hunter Jinwoo Sung has no money, no talent, and no prospects to speak of - and apparently, no luck, either! When he enters a hidden double dungeon one fateful day, he’s abandoned by his party and left to die at the hands of some of the most horrific monsters he’s ever encountered.