Al is a holy knight who fights off monsters until he's bitten by an undead and cursed to become one. 300 years later, Al meets a woman who will restore his body on one condition: he must become her knight and help her put an end to the undead!

Rentt Faina is down on his luck, and the dragon that kills him marks the end of his journey...or so he thought. He may be a pile of bones now, but not even death will stop him from achieving his goal of becoming a Mithril-class adventurer!

Rentt Faina, a decade-long adventurer, has been swallowed whole by a dragon inside the Labyrinth of the Moon's Reflection! Reborn as a Skeleton, will he succeed in his goal of Existential Evolution and return to humanity once more?