It is now U.E. 505, nine years after the war's end with the Empire of Zesskia claiming victory. The few surviving Fairy Soldiers find themselves struggling to adapt to peacetime: some continue to work for the new government, while others pursue darker paths, turning to terrorism or organized crime. Marlya is a new recruit of the organization "Dorothea," a government agency dedicated to the investigation and suppression of fairy-related crimes and incidents in a nation still suffering from instability and chaos.
Produced by P. A. Works (of Angel Beats! and Tenrou Sirius The Jaeger fame), written by Aoi Jumonji (of Grimgar of Fantasy and Ash fame) and directed by Kenichi Suzuki (of Drifters fame). The series premiered on April 7, 2019.
Funimation announced that an English voice track will be released to English-speaking countries/territories on April 28, 2019.
Fairy Gone provides examples of:
- Adaptation Expansion: The manga adaptation expands a little of the beginning of the story: when the fairy primordial breaks out of its bottle, one of the Carlin mafia men panics and attempts to shoot it at point-blank range. Marlya jumps between them and grabs the fairy, which is why it possesses her. This is a slight change from the anime, where she reached out for it because a mafia guard was trying to shoot Veronica's fairy but the shots were ricocheting off it and coming close to hitting the Fairy Primordial.
- Aerith and Bob: While most characters have common names like Veronica, Marco, Patricia and Damien, there are some unusual names like Wolfran and Bitter Sweet.
- Demonic Possession: Or Fairy Possession in this case. Fairies enter the body of a living being, creating some sort of Guardian Entity. Marlya is the first human shown in the series that is directly possessed by a Fairy Primordial instead of having a certain organ transplanted into her to do so like Fairy Soldiers.
- Deployable Cover: A very unconventional use of fairies. They are impervious to bullets, so their users can manifest them as mobile cover as needed.
- Doomed Hometown: The village of Suna where Marlya and Veronica were from, burnt during the war by traitorous fellow villager Ray Dawn. Wolfran as well, as his hometown of Branhut, Ledrad, was shelled and destroyed in the closing days of the war with his wife and daughter killed.
- Elite Army: The total number of Fairy Soldiers created during the war was just a bit over 300, counting all nations. Of these, only 17 have survived to see peacetime.
- The Fair Folk: The fairies in the show play more like this than the usual. While some primordial fairies look more like insects but very fairy-like, while the fairies that are actually used in fights look like the classic, more monstrous fairies.
- Fictional Currency: "Galey" is used in this universe.
- Government Agency of Fiction: Dorothea, the regulatory agency that arrests humans illegally using fairies, and the Ministry of Fairies it reports to under the government of Unified Zesskia.
- Great Offscreen War: The war that engulfed the Eastald continent is told mostly in narration until it was stopped after the continent was united under the great nation of Zesskia.
- Guardian Entity: Fairies manifest these, and like Stands, any damage taken by it reflects on its user, though when it comes to more serious injures like dismemberment or death, the user only feels the pain instead.
- Guns Are Worthless: Pistols and rifles have little effect on fairies, with bullets bouncing harmlessly off of them. Melee weapons give better results.
- Institutional Allegiance Concealment: A standard measurement used by Dorothea to infiltrate hostile places.
- Free goes undercover under the legend of a mafia soldier to unmask who's responsible for running an underground auction on fairies.
- Marlya goes with Klara to investigate Escreque in Sinquenje.
- Loads and Loads of Characters: Almost thirty characters (each of them accompanied by a name card) split up in several factions are introduced in the first 6 episodes alone, which can make it hard to keep track of everyone and their motivations. Granted, the action mostly follows a handful of them (notably Marlya, Free and sometimes Veronica).
- MacGuffin: The Black Fairy Tome, the latest and missing addition to the original Fairy Tome compilation, an authoritative compendium of knowledge on fairies from 200 years ago. The original Fairy Tome contains five works: the Original Text, the Blue Tome, the Red Tome and the White Tome, to which the Black Fairy Tome is the missing piece and concerns the phenomenon "Fairy Possession."
- Our Fairies Are Different: They are primordial spirits that possess animals and plants, and if organs of a fairy are transplanted to a human, they become able to summon it as a Guardian Entity.
- Shout-Out: The Fairy Tomes with their color theme naming to Andrew Lang's "Colored" Fairy Books.
- Spider Tank: Some transport trucks in the second episode move around using legs on their cabs with the trailer on wheels.
- Super Soldier: Fairy Soldiers are people who were transplanted a compatible Fairy organ. Individual Fairies can wipe out entire enemy platoons due to their resistance to firearms.