Day Zero

A Mercenary killed in action by a powerful esper is reincarnated in another world as a lowly Skeleton in a dungeon. He'll have to rely on his skills from his past life and the Esper ability he retained [Essence Extraction] to grow stronger and survive in this new world. However, with such a wide variety of skills available for the taking, "survival" might be more of a concern for the people of this new world instead.

Note: I do not own Re:Monster. Obviously. And will never claim as such. You should check out the original series if you haven't already. It's good.