Your Turn to Die: Death Game by Majority

Your Turn to Die: Death Game by Majority manga summary: Based on a popular game from Niconico. 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. Link to the original game. (Free, translated to english, and can be played in browser)