Kimi ga Shine -Tasuuketsu Death Game-

Sara Chidouin returns home from school late one night to discover that something's gone terribly wrong. When she comes to, she finds herself, her friend Joe, and 9 other people trapped in a mysterious place. Placed in life-and-death situations, they must come to an agreement about what they should do - and who should die. [From vgperson]