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.