Ice Dragon Girl and the Demon Lord

Students reincarnated in another world. There, they are forced to play a killing game in groups once every six months... Huh? They don't actually die, you know? Since it's just a game after all, even if they die, they'll be brought back to life later, and while the winners receive rewards, the losers get nothing—it's an extremely conscientious game, isn't it? And the protagonist is actually 2 people watching this game from the sidelines! Also, the update schedule is undetermined; I'll write whenever I feel like it.