First things first. My "reviews" system is explained on a blog entry. Which can be found through my profile.
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Note: Attempted to give of general gist and feeling I got out of this Manga, but I will admit I did kinda stray off towards rants a bit in this review. It's still related in a sense of giving this series opinion and rating, but not as directly. As reviews are highly subjective things, I attempt to give general thoughts. (but obviously.. I got still long way until I can tell myself "now I got pretty solid method of writing "reviews""
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✦Story
Not sure what to tell as it's pretty development based story. But I felt that growth, development and such were quite present in this Manga. Overall it felt pretty solid. Now as it's another shoujo slice-of-life Manga it has few points I would like to rant about, but to avoid that I'm going to say instead that the quirk what made this Manga fun was the whole premise of SMS exchange and hackers storyline. Which gave sense of mystery and as well surprisingly enough quite violent storytelling.

Whilst the hacker storyline and the whole plot of that was pretty nicely wrapped up. I felt the the relationship state of the main coupling felt a bit underwhelming by the end. Although story gave fair Amount time and moments of romance and insight of their relationship plus possible future, it still felt as it didn't really give as much impact or service regarding romance. But that was made up with a sense of growth and bond between the couple.

As whole story was pretty good.

✦Art
Not much to say, shoujo Manga enough. Good enough.

✦Character
To keep it short and possibly rant free. I'm going to say that the development and growth plus the bonding of characters was probably the best part of the characters.

Whilst on the other side, stereotypes and characters in general very quite unlikable. Not all of the, but a quite few.

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You can Ignore this part
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What I want to comment, which is a typical thing regarding shoujo genre. It's a bit of rant, but still I always feel like commenting. Is that I cannot ever comprehend the logic of such couples or the aimed demography being women. These types of shoujo Manga/Anime make me always feel and think that women are simply creatures who love being treated like shit, but now and then want to be patted. By that I mean main guy is the typical utterly full of himself bastard that treats people like junk and abuses, bullies, teases his woman frequently. Whilst main girl, never mind how much she gets hurt, she still loves the guy. Principle of "I'm getting daily beaten with baseball bat, but sometimes he pats my head so I love him. Oh and his job is torturing and killing people." MY POINT.. I simply cannot comprehend this and makes me always wonder if that is a seriously a common thing that women fantasize/like. But eh.. what forever alone understands about women right.
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✦Enjoyment & Overall
Aside the inner conflict I had with some characters, I still enjoyed this Manga quite a lot. It had lot of sweet moments, lot of drama and fairly interesting subplot of hackers, which gave off sense of mystery and surprising violence.

Romance had fairly good presence, but feel it was more of bonding oriented than actual love/romance. It's hard to explain, but it simply felt odd.

Moral of the story is that this Manga is pretty good, especially in sense of growth and development, whilst some other factors and oddly odd. Cannot even say bad. Just odd.

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Also, as always I can 90% for sure that I would have gotten much more into it, feel it and remember it better if this would be an Anime. I'm not a reader type, so I can't really remember most stuff I read, let alone feel or think. I lose focus and get annoyed when consume simply text. (thus why I absolutely rarely read actual book and rarely remember anything I read).
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In other words, this Manga would been so much more enjoyable if it would have Anime adaption.