Aisurukage, or Aisage to his friends, just lost his grandpa. He leaves the last fragments of his old life behind to go to japan, where his last remaining family member will take care of him. Unfortunately, before even meeting her, he dies. Yeah, unfortunate, isn't it? Not to him! Turns out, dying was the best thing that ever happened to him. He reincarnates into a new world as a shadow demon, and this time, he's determined to forge a life that he won't be so happy to give up.