Great manga with BOATLOADS of action! The story line is amazing and makes you feel pity for many of those who die. An amazing theme that goes on for the main hero are that "life flashes before your eyes when you're about to die so you can find a way out of your situation" which is so consistent and makes me so moved! The theme of initial revenge that turns into finding his own enlightenment really blew me away and I really enjoyed the characters that were in the story (even the villains!). It really show both sides of each story which can show that now all people have bad intentions at the start but are forced to due to their childhood circumstances and it now becomes a habit. I would highly recommend this manga as it definitely will hook you on (I finished 156 chapters in friken 3 days).
Every time you put down this manga you would want to pick it back up so be cautious!