Capcom Database

Ace Attorney Investigations: Miles Edgeworth, known in Japan as Gyakuten Kenji (逆転検事 lit. Turnabout Prosecutor?), is a single-player adventure video game developed and published by Capcom for the Nintendo DS. It is a spin-off installment and overall the fifth game in Capcom's Ace Attorney series of adventure visual novel games. The game stars prosecutor Miles Edgeworth, who investigates five cases that tie together to form an overarching story about a smuggling ring. The gameplay consists of investigation phases where the player investigates crime scenes in search for evidence and confront other characters to hear what they think has happened. the player is able to use evidence to find contradictions in the characters' statements, to get closer to the truth.

Ace Attorney Investigations: Miles Edgeworth was directed by Takeshi Yamazaki and produced by Motohide Eshiro. It was published in Japan on May 28, 2009, and in North America, Australia, and Europe, in February, 2010. A sequel, Gyakuten Kenji 2, was released in 2011. An iOS and Android port was released worldwide on December 2017.


Ace Attorney Investigations is a single-player adventure game in which players control prosecutor Miles Edgeworth, who investigates five cases. The game is mostly presented from a third-person perspective, occasionally switching to a first-person view when examining evidence. Each case involves playing through several investigation phases and rebuttal phases.

During investigation phases, players control Edgeworth directly, either with the D-pad, or by sliding the map that is displayed on the bottom screen. The player has Edgeworth walk around crime scenes in search for evidence; they also meet witnesses and suspects during these phases, who they can talk to. As Edgeworth notices various things in the crime scene, they are saved as Edgeworth's thoughts. Using the "logic" function, the player can connect two such thoughts to gain new information; for instance, by connecting two bullet holes with a gun that has only been fired once, Edgeworth will conclude that two guns must have been at the crime scene. At some points, the player is able to control a cursor to examine parts of the crime scene; by using the "deduction" function at these points, the player is able to point out a contradiction between the crime scene and evidence. If the player successfully points out a contradiction, they gain access to new information. At certain points, a device called Little Thief can be used to create hologram reproductions of the crime scene; by investigating these reproductions, the player can discover new information that would otherwise be hidden. As more evidence is uncovered, the hologram is updated. After having examined an area sufficiently, the investigation phase ends, and the game moves on to a rebuttal phase.

In the rebuttal phases, a witness or a rival character provides their idea of what has happened. The player is able to press them for details, and can present relevant pieces of evidence that contradict what the witness or rival is saying. By doing this, the player gets closer to the truth; it is through confronting suspects during these phases that the player solves the cases. Upon solving a case, the episode is cleared and a new episode is made available to the player. If the player makes mistakes throughout the game, such as presenting wrong pieces of evidence, attempting to connect two thoughts that do not match up, or making incorrect choices, a green gauge called the Truth Gauge decreases, representing Edgeworth getting further from the truth. If it is completely emptied, the game ends. By clearing an investigation phase, half of the gauge is restored, and by clearing an episode, the gauge is restored completely.



Promotional art.


  • Turnabout Visitor
  • Turnabout Airlines
  • The Kidnapped Turnabout
  • Turnabout Reminiscence
  • Turnabout Ablaze


Ace Attorney Investigations takes place between the third and fourth games in the series, Phoenix Wright: Ace Attorney − Trials and Tribulations and Apollo Justice: Ace Attorney. The story is split into five episodes, each focusing on a different crime, and tying together to form an overarching story revolving around an international smuggling ring. Public prosecutor Miles Edgeworth is the main protagonist and among the supporting characters are police detective Dick Gumshoe; Edgeworth's long-time partner and prosecutor Franziska von Karma; the rival character who first appeared in Phoenix Wright: Ace Attorney − Justice for All. New characters are female assistant partner Kay Faraday; the self-proclaimed Yatagarasu (a legendary thief who works to expose illegal corporate dealings), veteran police detective Tyrell Badd and new rival opponents Shi-Long Lang; an Interpol agent from the fictional country of Zheng Fa who bears a fierce hatred of prosecutors and the courts after his family's reputation was tarnished by a corrupt prosecutor, and his assistant Shih-na.


The backstory of the game is described in the fourth case, "Turnabout Reminiscence". Ten years prior to the game's present, the secretariat of the Cohdopian Embassy was accused of murdering Cece Yew, a witness to a smuggling ring's connection to the embassy. Prosecutor Byrne Faraday and detective Tyrell Badd attempted to convict the secretariat, but he went free after key evidence was stolen. Feeling that the justice system was powerless to those who stand above the law, Faraday, Badd, and Yew's sister Calisto, started stealing corporate files detailing illegal or unethical activities and exposed them to the media, under the name Yatagarasu. Three years later, another murder occurred at the embassy. During the trial, in which Faraday was the prosecutor, the suspect, Mack Rell, claimed that he had been told by Faraday to commit the murder, and said that Faraday was the Yatagarasu. A recess was held to replace Faraday with another prosecutor, Miles Edgeworth; before court was reconvened, both Rell and Faraday were found dead. Edgeworth discovered that Calisto had murdered Faraday with help from Rell, then killed Rell and made it look like Faraday and Rell had killed each other. When confronted, Calisto says that she is Yatagarasu, not mentioning her two partners, and that she is part of the smuggling ring. Faraday's daughter Kay is comforted over Faraday's death by Edgeworth, Badd, and detective Gumshoe; she believes her father to be the true Yatagarasu, and vows to catch the fake.

The game's second case, "Turnabout Airlines", takes place in the present, and has Edgeworth becoming involved with the smuggling ring during a trip aboard an airliner. An Interpol agent investigating the smuggling is murdered during the trip, and Edgeworth and a flight attendant become the main suspects. Another prosecutor, Franziska von Karma, works with Interpol to expose the smuggling ring; she and Edgeworth discover the murderer to be another flight attendant, who is working with the smuggling ring.

In the third case, "The Kidnapped Turnabout", Edgeworth is called by Ernest Amano, whose son Lance has been kidnapped and is held at an amusement park. While attempting to exchange the ransom money, Edgeworth is also kidnapped, but is freed by Kay, who calls herself the true Yatagarasu. They release Lance, and find the dead body of Oliver Deacon, who Lance identifies as one of the kidnappers. As Edgeworth investigates the mystery, he meets Interpol agents Shi-Long Lang and Shih-na, who believe that Amano's business group is involved with the smuggling ring; the ring's counterfeit money has ruined the economy of their home country Zheng Fa, so they seek to bring an end to the ring. Edgeworth learns that the kidnapping was a ploy by Lance to get money from his father, and that Lance had killed Deacon after the latter tried to back out of the plan. Evidence is found tying Amano to the smuggling ring, and Lang brings Amano in for questioning.

In the first case, "Turnabout Visitor", Edgeworth finds a dead body in his office. He learns that the murderer was Jacques Portsman, a prosecutor who was working for the smuggling ring, and was trying to steal evidence from the murder ten years ago from Edgeworth's office; as a detective got too close, Portsman killed him.

The fifth case, "Turnabout Ablaze", takes place at the former Cohdopian embassy; civil tension in Cohdopia forced the country to split into Allebahst and Babahl, which share the same embassy building. The two countries planned to announce their reunification at the embassy when the fake Yatagarasu appeared, setting fire to the building and killing two people. The bodies are found at the embassies' respective offices; one of them is discovered to be the former secretariat of the Cohdopian embassy, who now was the secretariat for Babahl. Shih-na is revealed to be Calisto in disguise; she insists that she did not murder the secretariat, and is revealed to be an accessory to the crime. As she is taken away, she reveals that she is not Cece's sister, that "Calisto" was just an alias she took while working for the smuggling ring, and that she became part of Yatagarasu on orders from the ring's leader. Edgeworth reveals the ring's leader to be Allebahst's and formerly Cohdopia's ambassador Quercus Alba, who had committed murders and covered the tracks of the ring, and brought counterfeit money into Zheng Fa. Alba, Amano and others are convicted of their crimes, while Edgeworth and his companions recommit to their vows to defend the truth.


The game was directed by Takeshi Yamazaki and produced by Motohide Eshiro, with character designs by Tatsuro Iwamoto,[1] and music by Noriyuki Iwadare and Yasuko Yamada.[2] Eshiro got the idea to make a new game featuring characters from the original Ace Attorney games while working on Trials and Tribulations. According to Eshiro, the game was made for portable play, and has an interface that uses the touch screen; as this could not be replicated on other platforms such as Xbox Live, he said that the Nintendo DS was the platform that was best suited for it, and that no ports to other hardware were planned.[3]

Eshiro said that they could have set the game in a courtroom similar to that of the main series and made a few additions, but that it would not have been very interesting; instead they moved the game to crime scenes, and added several new gameplay elements.[3] Yamazaki was the one who came up with the idea of making a game about deductive reasoning and crime scene investigation. Because of this theme, it made sense to them to include the Ace Attorney character Ema Skye in the game, as she is portrayed as wanting to be a forensic scientist.[4] Yamazaki originally suggested that Ema should be the main character, but based on fan feedback, they decided to use the more popular character Miles Edgeworth instead.[5] Figuring out how to move the game from the courtroom to the crime scene was a challenge for the development team. The team also thought that it was difficult to make the game feel new while also making sure it felt similar to the game series.[6] Because of the new gameplay systems that all had to be created from scratch, Ace Attorney Investigations took longer to develop than previous Ace Attorney games had.[7]

The concept of the story was that while each case is a standalone episode, they are also all interlinked, forming a larger mystery, with each episode revealing a piece of the puzzle.[4] Because Edgeworth is portrayed as a genius prosecutor, whereas Phoenix Wright is a rookie attorney, the development team felt that they needed to come up with incidents that were larger in scale for Ace Attorney Investigations, to match Edgeworth's skill level; therefore, the opponents were made "more formidable" compared to the ones in previous games in the series.[8] Eshiro saw the story as the most important part of the game, and said that, while time consuming, it was important to make sure that it works. This was accomplished through a lot of trial and error, and several rewrites and revisions: Yamazaki would come up with an idea, which was tested to see if players had a hard time understanding it. Based on feedback from the testers, Yamazaki would rewrite and reorder some parts, and add hints.[9] When creating the game's story, the development team took into account that some players might not have played any Ace Attorney games before. Because of this, they tried to make the game as accessible as possible, and make it playable without first having played any of the previous titles; for instance, the first part of the game is a tutorial that introduces the game and the characters. They did however add in-jokes for players who had played previous Ace Attorney games.[4] Kay Faraday was the first new character that was created for the game, and was cited by Eshiro as one of his favorite characters.[3]

The development team felt that with previous Ace Attorney games, players could identify with Phoenix Wright and Apollo Justice; for Ace Attorney Investigations, they wanted players to be immersed in the game and feel like they are Edgeworth. He said that they think players will feel a connection with Edgeworth and understand his character. As examples of this, Eshiro cited the ability to directly control Edgeworth, and the possibility to see inside his head:[4] the game's logic system was created because the development team wanted to show how Edgeworth thinks. It represents what is happening inside his mind, which Eshiro describes as a "very cool, calm and collected way of thinking".[3] For the rebuttal phases in the game, Eshiro wanted to try out new things that could not be done in courtroom battles: during rebuttals, several characters come in and out during each scene at a rapid pace, providing the player with evidence, to create drama with tension.[8] Ace Attorney Investigations has a larger focus on the environment than previous Ace Attorney titles had; previous titles featured gameplay elements in which the player finds contradictions in suspects' statements, whereas the goal of Ace Attorney Investigations is to find things at the crime scene that contradict the evidence the player has.[4] The game's third person perspective was specifically chosen to be different from the main series' first person perspective, and to show the environment so that players can walk around inside it. The game system was designed specifically for Ace Attorney Investigations, with the aim of being different from the main series; therefore, Eshiro felt that a lot of its features should stay within the Investigations series, and not be used in other Ace Attorney titles.[9]

The development team put effort into trying to make Edgeworth look right; Eshiro described Edgeworth's running animation as "graceful, while exerting effort", while Iwamoto was not entirely convinced and thought it looked like he is "walking really fast accidentally".[1] Eshiro and Yamazaki wanted to add a lot of features to the Little Thief system, but due to time constraints it ended up more simplistic than they had originally envisioned.[10] Eshiro used his experience with producing action games such as Shadow of Rome and laying out scenes to get backgrounds to move smoothly without scrolling issues when Edgeworth moves.[11] The programmers faced big technical challenges and had to make significant modifications to the game when implementing the graphics: in the game, two animated characters - whose graphics each are larger than those in previous Ace Attorney games - appear simultaneously and on top of smaller "mini-avatar" graphics. Eshiro said that he thinks they pushed the graphic processing ability of the Nintendo DS system to its limits for this.[8] Eshiro said that they would consider making DSiWare episodes if demand was high enough, but that they did not have any plans at the time. He said that there were many technical aspects to consider, such as memory limitations for DSiWare.[9]


For the game's localization, the main focus was to keep the dialogue natural and accessible to Western players, while also staying true to the Japanese version. The Japanese version had several instances of puns or cultural jokes, which would not have worked if they had been translated literally. There were also places in the script where the development team would have liked to insert jokes in the localization, but thought that it may be inappropriate to do so since the joke was not in the Japanese version. The team found difficulties in getting the Western version's tone right, as they wanted to keep the localized text interesting, and at the same time avoid inconsistencies with the original version's tone.[8]


The game was announced in Famitsu in April 2008.[12] A demo of the game was made available at Tokyo Game Show 2008.[13] It was also shown at San Diego Comic-Con International 2009, and appeared once more at Tokyo Game Show in 2009.[14]

The game was published by Capcom on May 28, 2009, in Japan, on February 16, 2010, in North America, on February 18, 2010, in Australia, and on February 19, 2010, in Europe. An iOS and Android version was released worldwide on December 8, 2017.[15][16][17]


A limited edition version of the game was made available in Japan, containing a business card holder, promotional videos, a CD with five tracks from an Ace Attorney concert performed by the Tokyo Philharmonic Orchestra, a pamphlet from the concert, a game box, and a copy of the game itself.[18] A bundle containing an Ace Attorney Investigations themed Nintendo DSi and a copy of the game was also made available in Japan.[19] The soundtrack album Gyakuten Kenji Original Soundtrack was released on June 24, 2009, by Suleputer.[2]


The game was met by generally favorable reviews, with a common complaint being that rebuttals at times devolve into trial and error.


  • "Turnabout Visitor" is the second episode in the series to date in which only one witness is cross-examined, with the first being "The First Turnabout" from the original game.
  • Phoenix Wright, Maya Fey and Pearl Fey makes a cameo appearance in "The Kidnapped Turnabout". At the beginning of Middle, Part 2, Edgeworth can leave 'Wild, Wild West' into the main gate where they are seen riding a boat in the background. Edgeworth can't interact in any way with Wright, Maya or Pearl, and their presence is not even acknowledged. In order to see these cameos, the optional visit to this area must be done before entering the kidnappers' hideout because they will have disappeared by the time the Blue Badger costume is found at the beginning of End, Part 1.


Character artwork[]

Box art[]



  1. 1.0 1.1
  2. 2.0 2.1
  3. 3.0 3.1 3.2 3.3
  4. 4.0 4.1 4.2 4.3 4.4
  7. 『逆転裁判』の話がしたい!!!, issue: 262, language: Japanese, journal: Nintendo Dream, publisher: Mainichi
  8. 8.0 8.1 8.2 8.3
  9. 9.0 9.1 9.2

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