The Limit, 2
"I can’t remember the last time I wasthisfreaked out by a manga... Remember the hubbub over the 2002 non-fiction book, Queen Bees and Wannabes: Helping Your Daughters Survive Cliques, Gossip, Boyfriends, and Other Realities of Adolescence by  Rosalind Wiseman? Parents  had quite the shocking wake-up call about  what their little girls could  really be like among their so-called  friends. Limit strips away all that made-up glamour and privilege, and throws the girls into a brutal 21st-century Lord of the Flies-survival-of-the-most-desperate-setting.  Thus the nightmare begins... I’m still shaking (and with that  cliffhanger-ending, can hardly wait to see what happens next)." - The  Smithsonian Institute'sBook Dragon"Suenobo manages to  write a scary thriller that’s sophisticated and suspenseful enough to  sustain an adult’s interest; the story’s occasional Grand Guignol  touches add a welcome dash of camp, preventing the story from sinking  under the weight of its Very Important Message. I can’t imagine what  will happen in volume two, but I’m looking forward to reading it… with  the lights on. Recommended." -Manga Critic "I realize that even acknowledging the fact that Keiko Suenobu's Limit isn't  your average shoujo story can alter expectations, but that needs to be  said right up front. While many conventions are adhered to, going into  this manga blind is best, so if you can go ahead and accept that Limit comes  highly recommended, do yourself a favor and pick up the first volume  with a clean slate. Don't even read the synopsis on the back and your  experience might just end up mirroring my own." -Otaku USA