Personally, I didnt LOVE this manga.
Others, however might find it pretty enjoyable. I dont like beating around the bush, so lets get straight to business~

STORY (8)
The story is pretty good--its somewhat original, at least. You have a popular interactive cell phone game called RABBIT DOUBT and a group of kids who suddenly find themselves experiencing firsthand the horror of having no one to trust in life-or-death circumstances.
"How does this happen?" you might ask.
Well, these kids are trapped in a dark, underground maze in the middle of nowhere. And they discover one of their friends brutally murdered in a room. They realize that the killer is among them and desperately search for a way out. 'Cept, they all suspect one another, and while they waver between doubt and trust, the killer strikes again!

ART (9)
I lurve this art style. I think you'll like it too. I hope you do.
The facial expressions are nice, you can tell when someone's confused or scared. The creepy scences look creeeeepy. And you can practically tell how unnerving it feels to be in that dark, dank, windowless middle-of-nowhere.

CHARACTERS (6)
Ugh. This was my least favorite part of the manga. The girls were clingy and weak and wimpy and insecure. Forget having no flavor, these girls left a bad taste in my mouth. I tried to like them. I really did. But there's only so much ANYONE can put up with.
The others were OKAY, but they werent amazing. They were all too busy suspecting each other and trying to make it out alive to try to make a good impression, I guess.

ENJOYMENT (7)
If you've read/seen Death Note, Code Geass, or maybe if you've read other psychological/horror themed manga, this isnt anything AMAZING. But its worth a read, if you're looking for something to kill time with. Going by the MyAnimeList definition of "7", its "good." Its not "very good" or "fair". Its not "great" or "mediocre". Its simply "good".

OVERALL (7)
Math time! (8+9+6+7)/4 = 7.5
BUT, MAL does not have a 7.5 in their scoring system.
So I'm going to be a little unfair here and round it down to a 7. Why? Like I said, its "good" but, in my humble opinion, not VERY good. Blame it on the wimpy characters.

I hope this helped, and I hope I wasnt too biased~