Rentt Faina, a twenty-five-year-old adventurer, has been hacking away at monsters for a decade. However, without much talent for the job, Rentt finds himself stuck hunting slimes and goblins for meager amounts of coin every day. Little does he know, all this is about to change when he comes across a seemingly undiscovered path in the Water Moon Dungeon.
What awaits him at the end of the path, however, is neither treasure nor riches, but a legendary dragon that wastes no time swallowing him whole! Waking up a short time later, Rentt finds himself not quite dead, but not very alive either- He is nothing more than a pile of bones! Armed with nothing but his trusty sword, tool belt, and ghoulish new looks, Rentt sets off on his quest as a newly reborn skeleton to achieve Existential Evolution, hoping to one day return to civilization with a more human form.
Will Rentt succeed, or will the dungeon consume him for the rest of his un-death. . . ?
What awaits him at the end of the path, however, is neither treasure nor riches, but a legendary dragon that wastes no time swallowing him whole! Waking up a short time later, Rentt finds himself not quite dead, but not very alive either- He is nothing more than a pile of bones! Armed with nothing but his trusty sword, tool belt, and ghoulish new looks, Rentt sets off on his quest as a newly reborn skeleton to achieve Existential Evolution, hoping to one day return to civilization with a more human form.
Will Rentt succeed, or will the dungeon consume him for the rest of his un-death. . . ?

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After accepting a plea for help to save a small village from marauding skeletons, Rentt stumbles into much more than he bargained for while searching for their source. There's almost no time to dig into his new discoveries, however-back in Maalt, the blacksmith Clope has an unexpected request of his own. And to top it all off, Rentt has the Silver-class Ascension Exam to prepare for!
Being an adventurer is busy work. Getting stronger requires constant effort-you can sleep when you're dead, after all! Unfortunately, for our unlucky undead hero, that doesn't apply!
The grind never stops in The Unwanted Undead Adventurer Volume 13!