Kimi ga Shine: Tasuuketsu Death Game

Best friends Sara and Joe are kidnapped one night, and wake up in a terrifying death trap. They manage to escape, only to find themselves in a large facility with 9 other people, all with collars around their necks. Sara and Joe eventually learn they must participate in a Death Game if they ever wish to escape, particularly in something called the "Main Game" where everyone must vote for somebody to die...