Set in a fictional 19th century England, is the story of Allen Walker, a 15-year-old boy who roams the earth in search of . Washed away to unknown parts of the world after The Great Flood, Innocence is the mysterious substance used to create weapons that obliterate demons known as . Allen has disappeared. Lavi and Lenalee rush to find him, only to wind up confronting a horde of akuma pursuing Allen's golem Timcanpy. After dealing with this they are ordered to continue their mission without Allen, his place to be taken by a new Exorcist—Miranda Lotto. Allen, meanwhile, wakes up inside the Asian Branch of the Black Ministry to the sobering reality that he has lost his Innocence!