 If you liked
Claymore
|
 ...then you might like
Koukaku no Regios
|
Claymore and Chrome Shelled Regios have many common things - like special warriors fighting monsters to protect humanity. The works are really similar and give off the same feeling. Chrome Shelled Regios isn't as dark as Claymore, but you get pretty much the same feeling from it. By the way, you'd better watch Chrome Shelled Regios's anime version if you want to get something similar to Claymore's manga.