i would personally say that this is one of the best manga's i have ever read. its got great humour, strong characters, a fantastic storyline and all the action you could hope for.
story: in the 3 books i have read, the story is very rich, no dull moments and your always finding out new things about the characters, just reading the first book will suck you in and make you demand to read more. it has all the elements in it, romance, action, a little horror, supernatural, highschool (at first) the books so far seem a little disjoint, the ultimate goal of the main character is unclear but it slowly starts to unfold throughout which just makes it all that more gripping.
art: the art at the beginning is very simple, almost ditsy as the story starts out this way but it becomes sharper and more clean cut as the story takes on a more serious approach. sometimes it can be a bit overly detailed to the point where its hard to make smaller detains out, mainly in the backgreoud but its easy to read.
characterss: the characters are amazing, their personal growth starts off almost nsignificant but they develope quickly and in a very exciting way. most of th main characters are very easy to fall in love with, especially sang as she turns out to be liturally the opposite of what she appears to be in the first half of the first book. as who she really is unfolds, you will be shocked over and over.
i really enjoyed the 3 books i have and have read them over and over without getting boured, i cannot wait to complete the set and finish the story. the story is intensly addictive and the humour makes it all that more fun to read. i give this a 10 out of 10 and am shocked that it isnt as poopular as it should be