Nine dead souls fell into the underworld at the same time and were forced to work in endless darkness. They didn't know each other, but they gradually got closer during the long ordeal.
Anger and obsession turned into a curse, and Jiugui made a blood oath: If he could return to the world, he would make the murderer pay with blood and hunt down all the villains in the world who caused similar tragedies. When the cracks in the underworld accidentally opened, a ray of fishy wind carried their resentment back to the underworld...
