Nitroplus

Nitroplus (Nitro+) is a Japanese game company specializing in Eroge Visual Novels. Its works are almost invariably dark-themed, with an abundance of Eldritch Abominations, horror, rape, gore and violence.

They first came to general attention with the release of Phantom of Inferno in 2000, which also was main writer Gen Urobuchi's first released work with the company. Since then it has become well recognized in visual novel circles, such as the releases of Saya no Uta in 2003 and Chaos;Head in 2006, along with Key Visual Arts, Type Moon and 07th Expansion.

Gen Urobuchi is one of the most prolific people in the company, as shown in the original light novel for Fate/Zero and their widely famous Puella Magi Madoka Magica, Nitroplus' second original anime.

Releases of Nitro+ (in chronological order):

 * Phantom of Inferno (2000)
 * Vampirdzhija Vjedogonia (2001)
 * Kikokugai: The Cyber Slayer (2002)
 * Hello, World (2002)
 * Deus Machina Demonbane (2003)
 * Saya no Uta (2003) - one of Gen's most famous - or infamous - works
 * Angelos Armas (2005)
 * Jingai Makyou (2005)
 * Hanachirasu (2005)
 * Sabat Nabe (2005)
 * Dra+Koi (2006)
 * Gekkou No Carnevale (2007)
 * Zoku Satsuriku no Django (2007) - also known as Tre Donne Crudeli
 * Nitro+ Royale - a fighting game
 * Chaos;Head (2008) - in collaboration with 5pb
 * Sumaga (2008)
 * Full Metal Daemon Muramasa (2009)
 * Steins;Gate (2009) - spiritual successor of  Chaos;Head 
 * Axanael (2010)
 * Robotics;Notes (2012) - spiritual successor to Steins;Gate (these three are now called "Science Adventures")

Nitroplus also has a branch focused on producing Boys Love Visual Novels: Nitro+ CHIRAL. Its works are listed below:

 * Togainu no Chi (2005)
 * Lamento-BEYONDTHEVOID (2006)
 * Chiral Mori (2008)
 * Sweet Pool (2008)
 * False Alkanet (2010)
 * DRAMAtical Murder (2012)

In addition, people from the company have worked on, or are credited in, other works:

 * Black Lagoon: Shaitane Badi (Light Novel, with Gen as author)
 * Blassreiter (TV series, with Gen as scriptwriter for several episodes)
 * Fate/Zero (Prequel of Fate/stay night; a series of four Light Novels produced in collaboration with Type Moon, with Gen Urobuchi as author)
 * Guilty Crown (has a PC game Spin-Off written by Jin Haganeya, who is also part of the show's writing team)
 * Muv-Luv and Muv Luv Alternative (Niθ, for some of the mecha designs)
 * Phantom ~Requiem for the Phantom~ (based on the story from the visual novel Phantom of Inferno. Also had a few episodes penned by Gen Urobuchi)
 * Puella Magi Madoka Magica (Anime First (read as not based on another work) series airing in Winter 2011, with Gen as scriptwriter, at least three artists doing ending cards, an upcoming Light Novel adaptation, a Play Station Portable game released in 2012, and three theatrical films in the works)
 * Queen's Gate novels (a trilogy of side-stories from the Queen's Blade universe that take place in our modern world, rather than the QB's fantasy medieval one. Niθ designed the characters from those novels.)
 * Rakuen Tsuihou (Anime film project co-produced between Nitro+ and Toei Animation, with Urobuchi writing the screenplay and to be directed by Seiji Mizushima)