Sooo. . . I thought how much this was like D. Gray man, cause of the whole organization hunting down people who are out to destroy the world. . . and so I went and googled witch hunter manwha plagiarism (exact words) and what I found shocked me.
Fullmetal Alchemist, Star Wars, Lord of the Ring, D. Gray Man, Berserk, DOGS, and Bleach were all victim to Witch Hunter's plagiarism. There were scenes taken from EACH (including Star Wars and Lord of the Ring) and put into Witch Hunter. Of course they were changed, but not by much.
If you don't believe me so far, how about when Tasha was unable to use his gun during battle? What happened to Ed in FMA while fighting Envy in lab 5? Or perhaps when Aria left Tasha to go with Varete? Did Rukia leave dying Ichigo to go with her brother? Keep reading.
I have read FMA and Bleach, and I have also watched Star Wars and Lord of the Ring. I was appalled at not noticing it myself.
I found this at http://forum.onemanga.com/showthread.php?t=91178
It was very. . . convincing. . . I am now going to cry. . . second good book this year to be found out to be plagiarized (both have Star Wars elements).