Tormented one

Tormented is a story about you where you save your sibling from death by making a deal with a demon lord. The deal was that your sibling would not die. In return, you would be trapped in hell where you would be chained to two pillars and suffer both physically and mentally for eternity. You will also be erased from existence so that no one knows you exist, and you will be known only like Tormented one. After many centuries, you will realize that the pain that plagued you has disappeared and the chains that were attached to the pillars are down. Now it is up to you what you do.