The Great Exorcist

In life, I sacrificed my best friend to eradicate the demons plaguing the world. The people bestowed upon me the title of "Archmage of Exorcism," but after death, I was cast into hell, forced to face the evil spirits born of those demons with my own eyes, unable to be reborn for all eternity. But I want to save them, even if it means suffering every torment they were meant to endure in their place! I will make this demonic scourge vanish from the world without a trace!