D.Gray-Man: Bygone

In the 18th century, the earth was infested with akuma, and there were people to deal with them. But, it's now the 20th century, and no one has even heard of such events. With no evidence of the exorcists, Noah, akuma, or even the Black Order, the precious story of D.Gray-Man has vanished from history. Until a certain girl starts having strange nightmares about the past. With the determination to figure out what her nightmares mean, she travels around the globe in hopes of finding the pieces to this unsolved puzzle.