There was once a mighty kingdom; technologically and magically advanced, morally superior to others, peaceful, and surrounded by plentiful resources. While newly emerged, it could've been an empire to rule the continent, and even more after that. That should've been its fate... If it wasn't for a lucky rat with the right skills to wipe out all of its inhabitants with a deadly plague. Now, granted to it by the system that every being has, it's been given a second chance at life for this monumental accomplishment. With the small amount of knowledge it gained in its previous life, an additional benefit as a side-effect from the reincarnation, and a little bit of luck, how will this small rat survive in a world of dangers.