
Access Games Inc. is a Japanese company specializing in the planning, development and distribution of video games and the research, development and distribution of software, data and video media. The company was originally founded in 1996 as a computer graphics producer.

Acquire Corp. is a Japanese video game developer and publisher, mainly known for their Tenchu and Way of the Samurai series.

âge is a division of Avex Pictures as of July 10, 2017, a Japanese developer and publisher of adult video games and visual novels. âge was formerly known as Relic and developed video games for consoles. It gained fame following the release of its 2001 adult visual novel Kimi ga Nozomu Eien. It was founded by Hirohiko Yoshida, Baka Prince Persia, Nanpuureima, Spin Drill, and Carnelian. âge games are published under the brands Âge, Mirage, and Φâge.

August is a Japanese visual novel studio under the publisher Hazuki . Although the company's name is spelled in Japanese using katakana, on the Internet August is known by the slang term Hachigatsu (八月). Hazuki and Hachigatsu mean August in Japanese.

Banpresto Co., Ltd. was a Japanese toy company, and a former game developer and publisher, headquartered in the Shinagawa Seaside West Building in Shinagawa, Tokyo. The current iteration of the company was formed on April 1, 2008, with the focus on the toy consumer business. The company was dissolved in February 2019 and combined to Bandai Spirits, with the company getting all the rights and duties of Banpresto.

Candy Soft is a Japanese visual novel publishing brand owned and used by Inter Heart.

Career Soft was a Japanese video game development studio founded in June 1996 by Team Career, a team within the Masaya Games, which was formed to develop Langrisser and Langrisser II. Career Soft continued to work with Masaya Games for the development of Langrisser III, Langrisser IV and Langrisser V.

CD Bros. is a Japanese erotic bishōjo video game maker with several divisions. Their products are localized in North America by J-List under the G-Collections label.

Cellius Inc. was a Japanese video game developer and publisher headquartered in Shibuya, Tokyo. It was founded in 2007 as a venture between Sony and Bandai Namco Holdings. The aim of the company is to "help take share from Microsoft Corp. and Nintendo Co." Sony hopes that the company will make up for the losses it made during quarter two of its financial year. 'Father of the PlayStation' Ken Kutaragi was announced as CEO. Bandai Namco Holdings held 51% of the company, and Sony held 49%. The company planned to use Sony's Cell microprocessor, the heart of the PlayStation 3, for PlayStation 3 games and games for mobile phones and personal computers. Its only video game project was a Ridge Racer game for the PlayStation Vita.

Circus is a Japanese visual novel studio known for creating adult-oriented bishōjo games. In addition to the normal Circus brand name, there are other brand divisions including Circus Northern, Circus Fetish, Circus Metal, and Sanctuary. Circus has also been involved in collaboration projects, creating titles such as True Tears, a collaboration with Broccoli, GameCrab, and illustrator Rei Izumi published under the brand La'cryma, and Sora o Tobu, Mittsu no Hōhō., an adult-oriented collaboration with Broccoli released under the same brand name.

Clap Hanz, Ltd. is a video game developer located in Japan. It is a second party company with strong ties with Sony Computer Entertainment and is the developer of the Everybody's Golf series. The company was established in 1998 and is headed by Masashi Muramori

Contrail was a Japanese video game production company best known for their work on Legend of Legaia and Wild Arms 2.

Cooking Mama Limited is a Japanese developer of video games. Most of their games were unreleased outside Japan and received no particular critical or commercial attention - notable exceptions to this are Cooking Mama for the Nintendo DS and iOS, and Cooking Mama: Cook Off for the Wii of the Cooking Mama series.

Crafts & Meister is a Japanese video game developer. The studio was formed in 2004 when former Capcom employees Noritaka Funamizu and Katsuhiro Sudo (producer) left the company. At its start, the company had 8 employees.

EIM Group was a Japanese game development company established in 1989 by programmer/musician Kenji Eno, who later started Warp.

Examu, formerly known as Yuki Enterprise, was a Japanese video game company founded in 2000. It mostly produced fighting games for arcades and home consoles. It is known for owning Team Arcana, the developer of the original intellectual property series Arcana Heart. Initially, they developed games for their own arcade system board called eX-Board, to release their games mostly on Taito's NESiCAxLive arcade delivery system. Support for eX-Board ceased in December, 2013. At the end of February 2020, Examu suspended their business operations. Any ongoing development works and product supports are migrating to Team Arcana.

GAE, Inc. , formerly Global A Entertainment, is a video game development studio located in Kichijōji, Tokyo, Japan. On February 12, 2009, it was renamed to GAE, Inc. The company is most well known for its popular Dungeon Maker series. They also released the Cosmetick Paradise series and Akudaikan series. A recent notable game by the developer is My World My Way for Nintendo DS and PlayStation Portable.

h.a.n.d. Inc. , abbreviation of Hokkaido Artists' Network and Development, is a Japanese video game developer. The company originally started as a service selling Macintosh hardware and software to universities before the Mac platform was widely known. When competition in the field increased, h.a.n.d. reorganized to develop original software.

Hamster Corporation is a Japanese video game publisher, with office located in Setagaya, Tokyo, Japan. The game division of Toshiba-EMI Limited spun off Hamster Corporation in November 1999.

Illusion is a company from Yokohama, Japan famous for developing eroge with 3D graphics. Originally, its games were not allowed to be sold or used outside Japan, and official support was only given in Japanese and for use in Japan. However, with the release of Honey Select Unlimited in coordination with the online English erotic game storefront FAKKU, Illusion's policy has since changed. Prior to this change in policy, they were often translated and released in English and other languages by fans.

Imageepoch Inc. was a video game developer based out of Tokyo, Japan.

Interchannel, Inc. was a Japanese video game developer and publisher. Previously known as NEC Interchannel and before that NEC Avenue, it was originally a subsidiary of NEC before 70 percent of the company was sold to Index Corporation for approximately 3 billion yen in 2004. Interchannel's games tended to be Japanese only, however the company established Gamebridge Ltd., a UK-based joint venture with Bergsala, that published its games in Europe. Only ten games were ever published.

Jupiter Corporation is a Japanese video game and hardware development studio that focuses on handheld consoles. It is based in Kyoto, though they have a secondary branch in Tokyo. Jupiter's motto is “Let’s Play! Let’s Smile!”.

KAZe Net Co., Ltd. is a video game industry developer headquartered in Aoyama, Tokyo, Japan.

Mastiff is an American publisher of video games, with offices located in both Tokyo and San Francisco. The executive staff includes Bill Swartz, Mika Hayashi, and Brian Bezdek.

Meldac is a Japanese music and video game company. They also had a subsidiary in America called Meldac of America before it became defunct in the 1990s.

MileStone Inc. was a Japanese video game developer. The team was composed mostly of ex-Compile developers who left to form their own company. They were best known for shoot 'em up games developed for the Dreamcast and its arcade counterpart, the Sega NAOMI.

MTO Co., Ltd. (エム・ティー・オー株式会社) is a Yokohama-based video game developer and publisher founded on May 28, 1996. The company is mostly known for the GT series of racing games that it has released and the more recent pet games such as Dogz and Catz.

Nintendo Research & Development No. 2 Department, commonly abbreviated as Nintendo R&D2, was a team within Nintendo that developed software and peripherals. While usually occupied in system operating software and technical support, the team would come back to early development in the 1990s where several new designers got their start at game development, the most famous being Eiji Aonuma who developed Marvelous: Another Treasure Island.

Racjin, formerly known as Racdym (ラクディム), is a Japanese video game developer located in Yodogawa-ku, Osaka, established in 1995. Its name was changed in 2000 to make it more easily pronounced to the Japanese.

Riverhillsoft was a Japanese video game manufacturer in operation from 1982 to 2000. They had notable releases for platforms such as the MSX, LaserActive, 3DO Interactive Multiplayer, PlayStation, Dreamcast, Game Gear, and PC-FX.

Seibu Kaihatsu Inc. was a Japanese manufacturer of arcade games. The company was founded in 1982 at Chiyoda-ku, Tokyo, Japan as Seibu Denshi Inc. (有限会社セイブ電子), but changed to its current name sometime in 1984. It is currently owned by Hitoshi Hamada.

Skip Ltd. is a Japanese video game developer that has a close relationship with Nintendo. Nintendo has published all of their Japanese releases; with the only notable exception being LOL, which skip Ltd. published independently. The company's staff includes prominent developers from Square such as Kenichi Nishi and Keita Eto. In August 2020, there were growing signs that the company may have become defunct, however this has not yet been officially confirmed.

Spike Co., Ltd. was a Japanese video game developer and publisher. Most of the staff were part of Human Entertainment. Human's Fire Pro Wrestling series was acquired by Spike after Human ceased operations. In April 2012, the company merged with Chunsoft to become Spike Chunsoft.

Suzak Inc. was a video game development company based in Japan. Suzak worked with Nintendo to create games based on their intellectual property, such as Wario: Master of Disguise and F-Zero Climax. They created numerous games for PlayStation 2, Game Boy Advance, and Nintendo DS.

Team Arcana is a Japanese video game developer founded in 2000, which mostly produce fighting games for arcades and home consoles, and was a video game division owned by Examu. It is known for developing the Arcana Heart series.

Thinking Rabbit was a software house based in Takarazuka, Japan, best known for being the original publishers of Sokoban.
Tokyo Shoseki Co. Ltd. (東京書籍株式会社) is a Japanese company engaged in the textbook and other publishing businesses. The company is well known as the largest publisher of textbooks in Japan, but also publishes reference books and Digital textbooks, educational assessment question, and many other general books, in a wide range of business areas.The company was founded in 1909.The company celebrated its 100th anniversary in 2009.

UEP Systems (ウエップシステム) was a Japanese video game developer founded in 1985. They were best known for their PlayStation-era snowboarding games, though they also released titles for PlayStation 2, Dreamcast, Neo Geo Pocket, and arcade.

Ukiyotei Company, Ltd. was a Japanese video game developer based in Yodogawa-ku. The company was founded on 15 March 1991 by Kenshi Naruse, who served as its representative director. The company is believed to have shut down in 2002.

Vanpool, Inc. is a Japanese video game, music software, computer software and toy developer. Its employees include Taro Kudou and Kazuyuki Kurashima, both of which worked for the independent game developer Love-de-Lic.

Windmill is a Japanese adult visual novel video game developer and brand used by Ares Co., Ltd. . They also have a sub-brand, Windmill Oasis, which produces high-quality games with 2D animation.

ZyX is a Japanese erotic bishōjo video game maker. Some of their products have been localized in North America by JAST USA under the G-Collections label, and most of them feature designs by either Masahiro Yamane or Keiji Muto.