Laughter At The World's End

In an era of ruin, mankind lives in fear of those branded with the 'Devil's Mouth' - Immortals who are demonised, hunted and killed, only to return and exact vengeance on those who have harmed them. Amid the endless cycle of hatred, a young girl and boy appear in a distant town, offering to bury an undead that has been tormentig its people. But who is this boy bears the mark of enemy? Could they be teh key to humanity's salvation?