Ousama Game, Touhyou Game: Anata ni Kuroki Ippyou wo Recommendations
In a similar vein to King's Game, Touhyou Game is about students that are forced to play a popularity contest. At first it was set up by the class clown as a bonding exercise, but then it is discovered that the person who loses the round or doesn't vote will die in a brutal accident/suicide.
Both mangas are about an elimination game which occurs among classmates who receive orders from an anonymous gamemaster. Tohyo Game is about a class participating in popularity voting where the person with the least amount of votes dies. Similar to it, Ousama Game is about a group of teenagers participating in a "King's Game" - they receive orders from an unknown sender and have to abide by them or else they will face punishment. Both pieces share many things in common such as setting, plot, genres, and atmosphere.