Ferrid's manga / #Skeleton(3)

It's like re:zero x overlord. A skeleton risen from the dead is granted the ability to return to his past self after death. The scenario is a bit confusing because he's already dead but is then undead but then he is killed as an undead and is brought back to a "save point" where he is still undead.

An adventurer gets turned into a mob level skeleton. In order to regain his humanity, he must level up and evolve