This manga is a crazies one but there is a must to enjoy the manga you should keep up with it.It sounds odd I know but you will cross with some odd chapters that for understand the point you will read a few times.Except that it's a really nice manga we have here.
Story
The story about a war which is about 12 families with extraordinary ability.(It's not about a school tournament fight trust me :D)It is sometimes take you a diffrent time(which is bound to main story and they're like explanations for main story).For saying something about story I think it's amazing(don't judge manga with anime anime is like a start for manga a warm-up(it's same for all mangas I think)
Art
Art is if you read Oh!Great before is amazing.But if u didn't it could be take a time to get used to it.But it's great for every way that I can't say something bad about it.
Character
It is well developed and the best thing I like about characters is the main's not ur regular type honest fighters.They're fighting dirty(but It's same for other chars but I was thinking that was a good point ^^;)and I don't think I seen same characters before so be sure they are not ur regular types.Everyone of them has a great story within themselves.
Enjoyment
I really enjoyed this manga I hope it won't finish soon.It's a great manga for it's genres so if u are into fight/actions don't miss this!!