People like Nobuaki Kanazawa

Ōsama Game (王様ゲーム, Ōsama Gemu, trans. "King Game") is a cell phone novel written by Nobuaki Kanazawa (pen name: Pakkuncho), consisting of five volumes. A film based on the novel was released in 2011, and directed by Norio Tsuruta. The theme song of the film is "Amazuppai Haru ni Sakura Saku" by Berryz Kobo and Cute. An anime based on the novel titled King's Game The Animation was also released in 2017 and directed by Noriyoshi Sasaki.

Ōsama GameOn October 19, a class of 32 students receive a message from a mysterious sender called "King" at midnight, giving them a set of rules and an order.Ōsama Game: ExtremeBeing the only survivor of the Ōsama Game and having chosen to continue the game, Nobuaki transfers to a new school, thus starting the tragedy once more.Ōsama Game: SpiralSet before the events of Extreme, it is about Natsuko's Ōsama Game before she transferred.Ōsama Game: Origin Thirty years ago, it was a day like any other in Kazunari's small village when the notes outlining the "Ōsama Game" arrived. The villagers received orders, which became more gruesome by the day, and those who failed to comply died, like clockwork. Growing desperation raises suspicions among the villagers regarding the King's identity and police converge on the town as its body count continues to rise.Ōsama Game: AnnihilationAll high school students in Japan must participate in the game.Ōsama Game: Abyss32 students from Japan, Korea, and Taiwan are gathered in an island in Taiwan. Then, a new command from the King was given.