Transferring to a new school can be difficult—even more so if you have no desire to make friends, as is the case with Nobuaki Kanazawa. However, the cause of his antisocial behavior soon becomes apparent when his class receives a text message from someone known as "The King." The message contains instructions for the "King's Game," and every class member is required to participate. Anyone who refuses to play, quits midway, or fails to obey an order within the 24-hour time limit will face a deadly punishment. Having played the game previously and witnessed the deaths of those around him, Nobuaki attempts to warn his unaware classmates. Unfortunately, they only believe him after the King's Game claims its first victims. Trapped in a horrific situation with no chance of escape, Nobuaki faces a choice: prioritize his own survival over those around him, or do what he failed to do before and save his classmates.