She became a Devil Hunter for the same reason as many, many others: revenge. However, upon fulfilling this revenge, she also managed to get further than she ever planned to. So for just over one-and-a-half years, a ghost has been haunting the headquarters of Tokyo Public Safety in her place; her co-worker Hayakawa Aki can only stand by and watch her precarious state deteriorate even further from days without sleep or proper meals. Well, up until a boy with a chainsaw cord in his chest shows up - as his unexpected and rather turbulent appearance brings the two together, Aki finds he might actually have a shot at saving her.