Nobuaki Kanazawa, a student with a troubled past, transfers to a new school with the intention of keeping to himself. However, his plans are disrupted when the entire class is forced to participate in a deadly game orchestrated by someone calling themselves "The King."
The "King's Game" involves receiving increasingly bizarre and dangerous orders via text message, with severe consequences for those who fail to comply. Knowing the horrors of the game firsthand, Nobuaki attempts to warn his new classmates.
As the game escalates and the stakes become higher, Nobuaki is faced with a difficult choice: protect himself or try to save his classmates from the King's cruel and deadly commands. He must overcome his past and decide how far he's willing to go to survive and potentially help others.