King's Game: Origin

The "King" has given his order, and his word is law! Kanazawa Nobuaki and his 31 classmates all receive a command in the form of a text from the King; failure to carry out the order results in death. It's a battle, not against the king but against themselves. Whom can they trust? Who will do anything to live?

Nobuaki Kanazawa is a high schooler. One day, he receives an email with an order from someone calling themselves "king". At first, the orders were normal. However, they started to escalate as time passed. Anyone not following the order was to be "punished" with "death"... The "King's Game" with their lives on the line has started!!! What awaits Nobuaki, who's facing against the invisible "king"!? (Source: Coolmic)