Fate/stay night is a Japanese visual novel game developed by Type-Moon. It was first released for Windows on January 30, 2004. The story takes place over three distinct routes: Fate, Unlimited Blade Works, and Heaven's Feel. It focuses on a young mage named Shirou Emiya, who becomes a warrior in a battle between mages called "Masters" and their "Servants" known as the Holy Grail War. In each route, Shirou bonds with a heroine and confronts different adversaries participating in the war.
An enhanced version, Fate/stay night Réalta Nua, was released in April 2007 for the PlayStation 2. Realta Nua was later ported to Windows in 2011, PlayStation Vita in 2012, and Android and iOS in 2015. A remastered version of Réalta Nua was released for Nintendo Switch and PC via Steam in 2024, marking the first time the game was made available outside Japan.
Fate/stay night was a critical and commercial success, and is considered a defining work in the visual novel genre. It received several anime and manga adaptations, beginning with a 24-episode anime series by Studio Deen, primarily based on the Fate route, which aired in Japan between January and June 2006. A film adaptation, Fate/stay night: Unlimited Blade Works, also by Studio Deen, was released in January 2010. A second anime television series, Fate/stay night: Unlimited Blade Works, was produced by Ufotable and aired between October 2014 and June 2015. A film trilogy by Ufotable adapted the Heaven's Feel route, consisting of three films: presage flower (2017), lost butterfly (2019), and spring song (2020). A manga series adaptation by Datto Nishiwaki was serialized in Kadokawa Shoten's Shōnen Ace magazine between February 2006 and December 2012. A second manga adaptation, based on Heaven's Feel and illustrated by Taskohna, began in 2015 in Kadokawa Shoten's Young Ace. A third manga adaptation, based on Unlimited Blade Works and illustrated by Daisuke Moriyama, began in 2021 in ASCII Media Works's Dengeki Daioh.
The visual novel spawned the Fate media franchise, consisting of many adaptations and spin-offs in various different media. A sequel visual novel, titled Fate/hollow ataraxia, was released in October 2005. A prequel light novel series titled Fate/Zero was published from 2006 to 2007, with an anime adaptation by Ufotable airing between October 2011 and June 2012. A spin-off magical girl manga series, Fate/kaleid liner Prisma Illya, began serialization in 2007, and has received several anime adaptations. Numerous spin-off video games have been released, including the fighting games Fate/tiger colosseum (2007), its sequel Fate/tiger colosseum Upper (2008), and Fate/unlimited codes (2008), as well as the RPG Fate/Extra (2010). A gacha game titled Fate/Grand Order was released for mobile platforms in 2015, which was a commercial success and has received anime adaptations by several studios.