I was reluctant to read this one, but I was soooo bored that I started it. And wow! Surprise!
Really this is a great manga, one of the best out there. I usually don't like comparisons, but due to Akiyama's resemblance with Yagami Light, I have to say that there are very nice contrasts. At the story level we can find many differences ( i.e. scenarios, characters, situations, etc.), Death Note is way wider than Liar Game, but I have to say: the last one has brought to me zero moments of boredom so far.
It's very enjoyable how every stage has simple rules and you'll see how they're pushed to extreme and unexpected levels. As many other readers say, it's true that lacks of romance, character development and action, but I think that's the purpose, this is ORIGINAL stuff.
As for the girl I don't really mind. I've read shoujo, so it's not worse that that. However, it's nice how she is completely naive and honest (bringing her back many problems) and starts to use this virtue in a different form. As for the other players, is truly delicious how they're forced to make alliances even though knowing they're enemies and that in any moment the war between them will begin.
If you are interested in politics and psychology issues, there are many references as well as analogies. Also if you're interested, you can check Game Theory, based on mathematical stuff but pretty close with economy, sociology and thus war, the branches controlling the world.
And overall, no one dares to ignore the game/drop out without paying. You've signed nothing, as law dictates you have no debt, but the fear of LGT office overcomes yourself and controls your mind.
I don't regret having read all the 141 chapters in less than 24 hours, hope you don't either.