Skeleton Enchanted by the Cursed Blade, Vol. 1: The Greatest Demon Lord, Who Conquers the Dungeon and Commands an Invincible Army (manga)

In the depths of the labyrinth, survival of the fittest reigns supreme. The strong prey on the weak—which dooms the skeletons, who are at the bottom of the food chain, to a life of fleeing from other monsters! That is, until their fateful meeting…Upon encountering a mysterious and powerful sword imbued with an enchanting sentience of its own, one intrepid skeleton gains a newfound hope that he’ll someday claw his way to the top!