An accident ended my young life. But it wasn't my time to die. I could have returned to the mortal world, but I was so sleepy that I missed this wonderful chance. As it happened, the underworld needed a runner, so I somehow ended up staying in what they call the underworld. I can't return to the mortal world, and I can't be reborn, so I drift around the underworld every day. In short, I just wanted to write a story where "I" really died, and imagine a different kind of underworld. P.S. The ideas are random, so beware of abandoned plotlines.
Great, great idea