NANKIDAI

Joe Tazuna has always been the most selfless person Sara Chidouin has ever known, someone she could count on to take a bullet for her. But that trust is put to the test when they wake up restrained to some strange tables and discover Joe holds a key that can set only one of them free. Thus begins a mysterious and sadistic game that will require all of their wits and faith in each other to survive…!

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)