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The so-called "Yatagarasu's Key" is a device that appears to turn from a knife into a key, and vice versa, when a switch on the end of the handle is released. The "key" portion is needed to unlock a safe in the Cohdopian embassy, revealing interior and a sort of latch hole. The latch hole is actually a second "keyhole" into which the "knife" portion of the key fits to reveal a secret back compartment of the safe. Manny Coachen used this secret compartment to hold stolen items for a smuggling ring.

Murder of Byrne FaradayEdit

Main article: Turnabout Reminiscence
The True Yatagarasu

The Yatagarasu.

Byrne Faraday who was one of three people who went under the guise of the Great Thief Yatagarasu. He infiltrated the secretariat's office at the Cohdopian Embassy and stole the key. However, in an unexpected move, Calisto Yew, another member of the Yatagarasu, sent the key to the police. Being the first piece of evidence directly sent to the police by the Yatagarasu, it was quickly coined as the "Yatagarasu's Key", although no one other than Yew and Coachen knew of the key's dual nature.

In reality, Yew was a mole working for an international smuggling ring, and her actions were part of a plan to get rid of Faraday. She instructed a hitman, Mack Rell, to kill an embassy staff member called Deid Mann, but the thug was caught on a security camera red-handed and put on trial for the crime. Yew then offered to be his defense attorney, telling him to initially claim to be the Yatagarasu; in court, he would suddenly accuse Faraday, who was to prosecute the case, of being the Yatagarasu.

Yewmurderfaraday

Yew moves to stab Faraday.

As Yew had expected, Faraday brought the key with him to the courtroom, intending to prove that Mack Rell was not the Yatagarasu by asking him about the function of the key. When Rell made his accusation towards Faraday, the trial went into recess, and the prosecutor took Rell to Defendant Lobby No. 2 to question him. Yew then entered the room and used the "knife" portion of the Yatagarasu's Key to murder both Faraday and Rell.

Murder of Manny CoachenEdit

Main article: Turnabout Ablaze

Seven years later, Manny Coachen used the key in self-defense against Quercus Alba by thrusting it into his left shoulder, resulting in a deep, hemorrhaging wound. However, Alba survived and fatally stabbed Coachen with a knife of his own. He then cleaned the blood off the key, replaced it in Coachen's pocket, and left the body in the victim's own office. Alba's intention was for investigators to discover the key and use it to open the safe in the office, thereby allowing them to find papers related to the smuggling ring and making it seem that Coachen was the leader of the smuggling ring. However, Miles Edgeworth's investigation unmasked Alba as the leader, with the Yatagarasu's Key being the final piece of evidence used to prove his guilt.

Ace Attorney Investigations: Miles Edgeworth evidence
Turnabout Visitor Prosecutor's Badge · Crime Scene Notes · Victim's Revolver · Secret Safe · Stolen 0-Series File · Master Key · Mr. Portsman's Office · Basketball Hoop · Note Left by Victim
Turnabout Airlines Prosecutor's Badge · Mr. Hicks's Travel Wallet · Crime Scene Notes · Sky Magazine · Photo of Mr. Hicks · Missing Cell Phone · Mr. Ifly Piggy Bank · Grape Juice Footprints · Cargo from Zheng Fa · Ms. Meele's Testimony · iFly Suitcase · Borginian Cloth · Suitcase Receipt · Autopsy Report · Alif Red Certificate · Alif Red Statue
The Kidnapped Turnabout Prosecutor's Badge · Gatewater Land Pamphlet · Bad Badger's Head · Blue Badger Bible · Badger Photo Rally · Stolen Costumes · Mr. Deacon's Murder Notes · Mr. Deacon's Pendant · Blue Badgermobile · Victim's Costume · Love Letter · Colin Devorae Dossier · Broken Prop Sword · Missing Model Gun · Ms. Paups's Pendant · Revolver · Mirror Fragments
Turnabout Reminiscence Prosecutor's Badge · KG-8 Incident Overview · Det. Gumshoe's Testimony · Handgun · Knife · Crime Scene Notes · Plastic Bag · Mr. Faraday's Fountain Pen · Annual Bonus Envelope · Swiss Roll · Det. Badd's Testimony · Det. Gumshoe's Fingerprints · Balloon Piece · Promise Notebook · Ms. Yew's Perfume · Mr. Faraday's Organizer · Yatagarasu's Key · Surveillance Video
Turnabout Ablaze Prosecutor's Badge · Embassy Guide · Steel Samurai's Autograph · Notes on Coachen's Body · Yatagarasu's Key · Allebahstian Knife · Babahl's Primidux Statue · Cohdopian Paper Document · Babahlese Knife Handle · Counterfeit Bills · Babahlese Ink · DeMasque II's Note · Samurai Sword · Photo with Steel Samurai · Passionflowers · Samurai Spear · Allebahst's Primidux Statue · Stand-In Request · Letter from a Stalker · Lady's Undershirt · Samurai Dogs · Silhouette Lantern · Pick · Ms. Yew's Perfume · Fountain Spouts · Photo of Yatagarasu · Fires in Babahl · Amb. Palaeno's Testimony · Wire · Revolving Fireplace Wall · Crossbow Arrows · Trump Card · Video Tape · Counterfeit Plate · Amb. Alba's Wound · Commemorative Photo · Security Footage · Pushcart
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