Skeleton, a class of the undead. In this world called Guerra, they are known to be immortal but are discriminated for a certain reason. Bonné who lived for thousands of years was mistreated ever since he was born. He was confined in a dungeon for hundreds of years because his kinds' existence was an atrocity to humans. A young girl miraculously appeared out of thin air, introducing herself as Mavis. She befriended him amidst his status, even disregarding his fallacious crimes. Upon meeting Mavis, he gave his life a chance; leaving his past demise. For a short time, he experienced 'happiness' until fate decided to kill him. But fate wasn't as harsh as expected, he was given an opportunity to live once again.