Allison, a young woman with a severely troubled past who signs up for an extreme haunt called Perdition. She believes that putting herself through Perdition's nightmarish trials will help her exorcise her internal traumas, but has no way of knowing just how shocking her ordeal will be-or what dark secrets buried in her psyche will emerge.

Set in a future-world vision of Tokyo where the police have been privatized and bitter self-mutilation is so casual that advertising is often specially geared to the "cutter" demographic, this is the story of samurai-sword-wielding Ruka and her mission to avenge her father's assassination. Ruka is a cop from a squad who's mission is to destroy homicidal mutant humans known as "engineers" possessing the ability to transform any injury to a weapon in and of itself.