This is one of the best manga i've have read in a long time, really even if sometimes you might say "this manga goes too slow and doenst show much battles like on some other mangas", the story is excellent, the main characters are very realistic, they art is really good as expected from the artist who has made great mangas before and finally its really enjoyable since you always want to see what happens next.
I really recommend it for those people who like a lot of violence