Mai Yashiro's mundane existence as an average office worker is turned upside down when she receives a video game console on her doorstep. The game that she is forced to play is called "Nightmare" and it's a dangerous game that not only puts her own well-being at risk, but also the lives of those she loves. If she refuses to play, her loved ones will not survive, but if she loses a game within the "Nightmare" world, she may suffer permanent physical impairments. The game's intense horror quickly spreads throughout society, and Mai's company creates a "Nightmare" Strategy Team to combat its evil. Encouraged by her fellow team members, Mai fights valiantly against the wicked game. This adaptation comes from a popular online novel with over 40 million followers.
