Ashil, a soldier whose kingdom was destroyed by the Demon Lord's army and whose beloved Princess Safia was taken from him, is reborn as the weakest skeleton in a kingdom teeming with undead. In order to rescue Princess Safia, who is still held captive, he aims to "evolve" as a monster and vows revenge against his enemies! The tale of saving a fallen kingdom and rising from the weakest to the strongest begins!!!