Relocating to a new educational institution can be challenging for those who lack a social inclination like Nobuaki Kanazawa. However, in his case, it's a blessing in disguise as a mysterious person known as "The King" sends the class a message with instructions for the ominous "King's Game." All pupils are obliged to participate, and failure to comply or follow the rules within 24 hours results in severe penalties. Nobuaki endeavors to alert his classmates about the deadly game's consequences, but unfortunately, his warnings fall on deaf ears. It's only when the game claims its first victims that the students realize the gravity of their situation. Faced with no viable escape, Nobuaki must choose between prioritizing his survival or risking his life to save his classmates.