King's Game

Nobuaki's classmates start receiving mysterious text messages from someone who calls themselves 'The King'. At first the texts are just simple commands, but soon they escalate and those who don’t follow the orders are being killed! Fearing for their lives, classmates turn on each other and that’s when the murders begin... The story originates from a mobile game horror novel and has been adapted into a live-action film, and a full-length anime.