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Dozens of Square Enix companion books have been produced since 1998, when video game developer Square began to produce books that focused on artwork, developer interviews, and background information on the fictional worlds and characters in its games rather than on gameplay details. The first series of these books was the Perfect Works series, written and published by Square subsidiary DigiCube. They produced three books between 1998 and 1999 before the line was stopped in favor of the Ultimania (アルティマニア, Arutimania) series, a portmanteau of ultimate and mania. This series of books is written by Studio BentStuff, which had previously written game guides for Square for Final Fantasy VII. They were published by DigiCube until the company was dissolved in 2003. Square merged with video game publisher Enix on April 1, 2003, to form Square Enix, which resumed publication of the companion books.
Both the Perfect Works and Ultimania books have focused primarily on Square and Square Enix's role-playing video game franchises, such as the Final Fantasy and Kingdom Hearts series; over half of the more than 75 books are for games related to the Final Fantasy series. Sometimes, multiple books have been written per game or revised editions have been published years afterwards. One of the books, Final Fantasy IX Ultimania Online, was solely published online as part of an experiment by Square Enix with online content delivery; another for Final Fantasy XI was planned, but the idea was abandoned as unsuccessful and all subsequent books have been published traditionally.
The books are written and edited by Studio BentStuff; beginning with Final Fantasy VII Remake Ultimania in 2020, they switched to be credited to both Studio BentStuff and its parent company Digital Hearts, and since 2023 with Final Fantasy XVI Ultimania they have been credited solely to Digital Hearts. The Ultimania series had sold over 10 million books by July 2007, increasing to over 12 million copies sold as of 2017. The highest selling Square Enix companion books are Final Fantasy VIII Ultimania (over 2.2 million copies) and Final Fantasy X Scenario Ultimania (over 1 million copies). All of the books have been released solely in Japanese, but Dark Horse Books published English translations of the three-volume 2012 Final Fantasy 25th Memorial Ultimania as Final Fantasy Ultimania Archive in June 2018, and an English translation of the 2014 Kingdom Hearts Series Memorial Ultimania as Kingdom Hearts Ultimania: The Story Before Kingdom Hearts III in June 2021.
アルティマニアシリーズの累計発行部数が1,000万部を突破! [The cumulative circulation of the Ultimania series has exceeded 10 million!] (in Japanese). Studio BentStuff. 2007-12-29. Archived from the original on 2011-10-04. Retrieved 2013-03-05.
"会社情報" [Company Information]. Studio BentStuff (in Japanese). 15 June 2016. Archived from the original on 2017-01-12. Retrieved 21 February 2021.
"会社沿革" [Company History]. Studio BentStuff (in Japanese). 15 June 2016. Archived from the original on 11 May 2021. Retrieved 21 February 2021.
スクウェア公式 サガフロンティア2設定資料集 [Square Official Saga Frontier 2 Setting Documents Collection ] (in Japanese). 1999-07-15. ISBN978-4-925075-54-1.
Front Mission 3 Perfect Works―スクウェア公式フロントミッションサード設定資料集 [Front Mission 3 Perfect Works―Square Official Front Mission Third Setting Document Collection ] (in Japanese). 1999-11-20. ISBN978-4-925075-66-4.
Ultimania シリーズ[1] [Ultimania Series ] (in Japanese). Studio BentStuff. Archived from the original on 2012-04-21. Retrieved 2013-03-01.
=Ultimania シリーズ[2] [Ultimania Series ] (in Japanese). Studio BentStuff. Archived from the original on 2012-04-21. Retrieved 2013-03-01.
^ Ultimania シリーズ[3] [Ultimania Series ] (in Japanese). Studio BentStuff. Archived from the original on 2012-05-18. Retrieved 2013-03-01.
Ultimania シリーズ[4] [Ultimania Series ] (in Japanese). Studio BentStuff. Archived from the original on 2012-03-07. Retrieved 2013-03-01.
Ultimania シリーズ[5] [Ultimania Series ] (in Japanese). Studio BentStuff. Archived from the original on 2012-05-05. Retrieved 2013-03-01.
Ultimania シリーズ[7] [Ultimania Series ] (in Japanese). Studio BentStuff. Archived from the original on 2012-05-18. Retrieved 2013-03-01.
Ultimania シリーズ[8] [Ultimania Series ] (in Japanese). Studio BentStuff. Archived from the original on 2010-04-09. Retrieved 2013-03-01.
Ultimania シリーズ[9] [Ultimania Series ] (in Japanese). Studio BentStuff. Archived from the original on 2010-04-09. Retrieved 2013-03-01.
Ultimania シリーズ[10] [Ultimania Series ] (in Japanese). Studio BentStuff. Archived from the original on 2012-05-05. Retrieved 2013-03-01.
Ultimania シリーズ[11] [Ultimania Series ] (in Japanese). Studio BentStuff. Archived from the original on 2010-04-09. Retrieved 2013-03-01.
Ultimania シリーズ[12] [Ultimania Series ] (in Japanese). Studio BentStuff. Archived from the original on 2010-04-09. Retrieved 2013-03-01.
Ultimania シリーズ[13] [Ultimania Series ] (in Japanese). Studio BentStuff. Archived from the original on 2012-03-07. Retrieved 2013-03-01.
Ultimania シリーズ[15] [Ultimania Series ] (in Japanese). Studio BentStuff. Archived from the original on 2010-04-09. Retrieved 2020-06-21.
大判でフルカラー208ページの豪華仕様!「ファイナルファンタジーVII 10thアニバーサリー アルティマニア」 [Large format, full-color, 208-page luxurious specification! "Final Fantasy VII 10th Anniversary Ultimania"] (in Japanese). Studio BentStuff. 2007-07-31. Archived from the original on 2012-03-07. Retrieved 2013-03-01.
「ディシディア ファイナルファンタジー アルティマニアα」大判サイズで12月4日に発売! ["Dissidia Final Fantasy Ultimania α" will be released on December 4 in large format!] (in Japanese). Studio BentStuff. Archived from the original on 2010-01-04. Retrieved 2020-06-21.
ファイナルファンタジーI-VI ピクセルリマスター メモリアル アルティマニア [Final Fantasy I-VI Pixel Remaster Memorial Ultimania] (in Japanese). Studio BentStuff. 2023-04-20. Retrieved 2024-12-02.