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He is currently working in a shop cleaning and adjusting the engine relics brought back from the desert labyrinth by the adepts, while also studying engine technology on his own. He dreams of getting out of the city and buying an airship. He's the protagonist of the first chapter.

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Ati is one of Gii’s few friends, “the revival” has caused her to mutate into something resembling a half cat. She is usually very energetic, and is very attached to Gii.

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Part, along with her friend Shela, of the 2-women crew of a small merchant steam-powered airship known as the Ulumensh. She's a trader, member of the 6th class frontier city of Dylas-Leen's Air Guild. With the aid of her airship she buys, sells, exchange and deliver all sort of stuff between various... read more

Part, along with her friend Shela, of the 2-women crew of a small merchant steam-powered airship known as the Ulumensh. She's a trader, member of the 6th class frontier city of Dylas-Leen's Air Guild. With the aid of her airship she buys, sells, exchange and deliver all sort of stuff between various neighboring locations. Orphan, still emotionally tied to her former orphanage, so much to donate most of her earnings to it. This, until the day she decides to save a mysterious green haired girl from the Empire's Army...

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One of the main heroines, and the only one on the surface. She is a girl with an Elysian Eye who travels through the ruins of New York on the surface. Three years ago (1904) in December, her left eye gained its golden, feline hue. She harbors a strong will and bravery that belies her demure appear... read more

One of the main heroines, and the only one on the surface. She is a girl with an Elysian Eye who travels through the ruins of New York on the surface. Three years ago (1904) in December, her left eye gained its golden, feline hue. She harbors a strong will and bravery that belies her demure appearance. She is also tough, and she comes to the vast, ruined remains of old New York City all by herself, without anyone's aid. As she traverses the very real ruins, she is joined by her Tarantula, a multi-legged ambulatory bag she created herself. Normally she would be a student attending Yale Engine University, but she's currently taking a break from it. Back when she attended high school in her home state of Connecticut, there was a man she held some affection toward. Even though they both felt deeply for one another, they never managed to become lovers. As her recollections and past memories are revealed, it becomes clear that man is who she searches for in the ruins of old New York.

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Guy is a travelling doctor who walks around the slums of the city, healing the sick. Because of “the revival”, his brain gained mutations which gave him skills in curing the most stubborn of human diseases, through mutated diseases are a whole other matter. His mutations have also forced him to lose... read more

Guy is a travelling doctor who walks around the slums of the city, healing the sick. Because of “the revival”, his brain gained mutations which gave him skills in curing the most stubborn of human diseases, through mutated diseases are a whole other matter. His mutations have also forced him to lose his physical senses and much of his emotions. He also believes that it has robbed him of his sanity, as he keeps seeing a dancing clown at the edge of his vision. However, his life is (once again) changed forever, when he meets the girl named Kia.

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One of the main heroines, and the one who wanders the fantastical Underground. At first this young girl is seen dressing as a man, and she frequently sports either a cold or slightly upset expression. She's simple, frank, and rather childish for her appearance. Occasionally she also displays an une... read more

One of the main heroines, and the one who wanders the fantastical Underground. At first this young girl is seen dressing as a man, and she frequently sports either a cold or slightly upset expression. She's simple, frank, and rather childish for her appearance. Occasionally she also displays an unexpected strength of will. She has no memories about herself, and she doesn't even understand why she is in the Underground New York City full of fantasies and distortions. The first memory she has is opening her eyes and seeing that false, violet sky. Though she recognizes the Underground as fantastic and abnormal, she has no desire to return to the surface. Even when asked about that, she only gives back a look of confusion. At first she doesn't understand that her world is the one full of fantasies and illusions while the real New York is in ruins. She shows curiosity and interest in everything she lays eyes upon. She's lost all memory of everything save her language and common sense, yet despite that she knows she must go forth to the tower of violet shadow towering over Manhattan. At first she's lacking in humanity, but as she meets new people and witnesses their Refrains, she finds herself unwittingly shedding tears and eventually realizing the strength of the feelings deep within her—

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Mary Clarissa Christie is a girl living by herself while her mother works abroad. She attends university with her friends, Angelica Derleth and Charlotte Bronte, and lives a peaceful life. However, through a chance encounter, she finds herself drawn into another side of London- spoken of only as rum... read more

Mary Clarissa Christie is a girl living by herself while her mother works abroad. She attends university with her friends, Angelica Derleth and Charlotte Bronte, and lives a peaceful life. However, through a chance encounter, she finds herself drawn into another side of London- spoken of only as rumors of "Metacreatures" who roam the night and attack people. She forms a contract with a strange man in a black suit, known as 'M', and begins to help him hunt these creatures...

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She lives with her younger brother Cathim in a room in a public housing complex in the Mazandaran district. She is deeply in love with her brother, but she tries not to think about whether it is a familial love or a forbidden love. As an adept who spends most of her time in the labyrinth, she cheris... read more

She lives with her younger brother Cathim in a room in a public housing complex in the Mazandaran district. She is deeply in love with her brother, but she tries not to think about whether it is a familial love or a forbidden love. As an adept who spends most of her time in the labyrinth, she cherishes her rare daily life with him. Her parents were both adepts, and they're said to have lost their lives in the labyrinth. She's the protagonist of the ninth chapter.

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He meets Connie in Dylas-Leen while trying to protect a certain green-haired girl from the Imperial Army. He was apparently looking for her as well... He's combat-capable and saves the day, but his real objective is unknown.

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A young adept living with his sister Ana in the Mazandaran district. He has purple hair and he usually wears glasses, which he removes during battle. He has lost his right arm in the past, which has been replaced by an artificial limb. He's the protagonist of the second chapter.

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Kia is a mysterious little girl. Despite the efforts of the city’s best information brokers, no one seems to know about who she is and where she comes from, and she herself is very adept at dodging question. She is very mature for her seemingly young age, and can easily do housework and tell when pe... read more

Kia is a mysterious little girl. Despite the efforts of the city’s best information brokers, no one seems to know about who she is and where she comes from, and she herself is very adept at dodging question. She is very mature for her seemingly young age, and can easily do housework and tell when people are lying.

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Orphan of mysterious origins, Connie took her in as a child and taught her all she knew about airships, she has been with her since. Her past is mostly unknown, but her overall appearance and capabilities makes it clear that she's a member of the heavily persecuted Pucelle specie. Her excellent eyes... read more

Orphan of mysterious origins, Connie took her in as a child and taught her all she knew about airships, she has been with her since. Her past is mostly unknown, but her overall appearance and capabilities makes it clear that she's a member of the heavily persecuted Pucelle specie. Her excellent eyesight and her astounding ability in messing with machines make her an irreplaceable member of the Urmensch's crew.

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Imperial Princess of the Northern Central Empire. She was welcomed as a member of the Imperial Family because she inherited the blood of the first emperor and developed golden eyes. She is a genius in mathematics and engine technology, and was sent by the Northern Central Empire to play a key role i... read more

Imperial Princess of the Northern Central Empire. She was welcomed as a member of the Imperial Family because she inherited the blood of the first emperor and developed golden eyes. She is a genius in mathematics and engine technology, and was sent by the Northern Central Empire to play a key role in the desert city's plan to become a prominent engine city. She is engaged to be married to Harut. She's the protagonist of the fifth chapter.

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Francisca's twin sister, working on Infinitely Crowded Street with her.

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Ati's comrade, both of them are Runners, most of their work take place around the City Skyscraper. He has implanted Crack Engines with motor reflexes. He's fast, faster than most, that's valuable in and of itself. When this guy's around, survival rates go up. (Edited from in-game text)

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Informant working on Infinitely Crowded Street with her twin sister Agnes. Twin pink sheep, sometimes cute, and sometimes strong, they're residents of the vitriolic Lower Tiers. Normally, it'd be very hard for girls this young to achieve fixed bodies and minds as Fantastic Mutants, even so, they'd d... read more

Informant working on Infinitely Crowded Street with her twin sister Agnes. Twin pink sheep, sometimes cute, and sometimes strong, they're residents of the vitriolic Lower Tiers. Normally, it'd be very hard for girls this young to achieve fixed bodies and minds as Fantastic Mutants, even so, they'd done it. By greedily searching for money, they'd kept themselves alive. They're strong at times. They can mingle with the filth writhing around Infinitely Crowded Street. (edited from in-game text)

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A man named Randolph. Back when he was still human he was praised as the first of the peerless Scholars. He'd been insane for a long time, even before the City warped. He desires the truth. The truth of the City? Why the City turned into this? No, that's not it. He desires that which is truth to him... read more

A man named Randolph. Back when he was still human he was praised as the first of the peerless Scholars. He'd been insane for a long time, even before the City warped. He desires the truth. The truth of the City? Why the City turned into this? No, that's not it. He desires that which is truth to him. (Edited from in-game text)

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A Crack Engine-Type Automaton, a humanoid Engine Machine constructed out of steel and made to perform labor in place of humans. It wouldn't be an overstatement to say it had an artistic level of completion. Automatons usually prioritized functionality, so they didn't bother to accurately imitate the... read more

A Crack Engine-Type Automaton, a humanoid Engine Machine constructed out of steel and made to perform labor in place of humans. It wouldn't be an overstatement to say it had an artistic level of completion. Automatons usually prioritized functionality, so they didn't bother to accurately imitate the human form, but, "she" could easily be mistaken for a human. Her voice sounded utterly indistinguishable from a human's and the whole shape of the body had been designed with balance and beauty taken into account, it was incredibly smooth, even its spherical joints appeared elegant. (Edited from in-game text)

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He is the Measurer. He is the Steel Knight. He is the Fool. (edited from in-game text)

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Las Casas's grandson, a very young Dylas-Leen's Air Guild mechanic, so hardworking and brilliant to became a Scholar at a very young age. He has a crush on Shella.

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Leo's assistant. She's the protagonist of the fourth chapter.

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A storyteller who spins various tales, from ancient anecdotes to tales of heroes that no one has ever heard, to fables of the "furukimono" that once existed on the planet.

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A girl who laughs as she watches Lily. She's a denizen of the Underground, and maybe human? She bears cat ears atop her head and a tail grows from her butt, making her an abnormal girl with slightly different features than a proper human. She likes to appear in high places and chuckle as she looks ... read more

A girl who laughs as she watches Lily. She's a denizen of the Underground, and maybe human? She bears cat ears atop her head and a tail grows from her butt, making her an abnormal girl with slightly different features than a proper human. She likes to appear in high places and chuckle as she looks down at Lily. She has a hedonistic attitude, and she's always smiling. She frequently laughs at others as well, but she takes no pleasure in doing so. The truth is that she actually wishes she could stop smiling and laughing. Her true form is different from her current appearance, but just like Jaguarman, she gained the outward appearance of a beastman due to her own internal nature. Though there is one definitive difference between her and the jaguar man.

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This is the man who'd said that no matter how hellish the City became, it wouldn't change the fact that money was the magical tool for obtaining everything. Fixer Stanislaw, the black market dealer, it was of no personal concern to him who lived and who died. By the standards of ten years ago, Fixe... read more

This is the man who'd said that no matter how hellish the City became, it wouldn't change the fact that money was the magical tool for obtaining everything. Fixer Stanislaw, the black market dealer, it was of no personal concern to him who lived and who died. By the standards of ten years ago, Fixer Stanislaw would never be considered a good person, it simply wouldn't be possible. (Edited from in-game text)

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An expressionless young man full of mystery who never reveals anything about himself. He is the one guiding Lily through the Underground. Some have dubbed him "The Faceless Man" or "Air Head". He is the one who gives the name "Lily" to the young girl with an Elysian Eye that set foot in the fantas... read more

An expressionless young man full of mystery who never reveals anything about himself. He is the one guiding Lily through the Underground. Some have dubbed him "The Faceless Man" or "Air Head". He is the one who gives the name "Lily" to the young girl with an Elysian Eye that set foot in the fantastical realm of Underground New York, and he also operates that One-Car Subway Train that seems to move and stop at its own will while guiding Lily toward Manhattan. He rarely displays any emotion, and occasionally he protects Lily from danger even as he flatly tells her the truth.

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A strange girl with green eyes and hair appeared out of nowhere. She's carrying a certain green book, a book that prime minister "De Maxim" is determined to obtain at all costs.