1. The Unclaimed Body

The body had no name, which was, Detective Shinsuke Furuyama supposed, the entire point.

It lay on a steel gurney inside the Higashikai Port Authority morgue, a low-ceilinged room that smelled of formalin and the faint, persistent brine of the harbor. Furuyama stood with his hands in the pockets of a coat that had been expensive five years ago, watching the medical examiner peel back a white sheet with clinical indifference. The dead man was in his seventies, gaunt, with skin the color of weathered cedar. His hands, folded across his chest, showed the cracked nails and calloused pads of a lifetime spent gathering what others discarded. A ragpicker. One of the invisible men who shuffled through the docklands before dawn, dragging carts of scrap metal and flattened cardboard.

“Cause of death?” Furuyama asked.

“Exsanguination,” said Dr. Hasegawa, a woman who had performed autopsies for thirty years and had long since stopped finding anything remarkable about human mortality. “Single puncture wound to the left subclavian artery. The instrument was thin, cylindrical, approximately two millimeters in diameter. No tearing. No signs of struggle. He was either unconscious when it happened or he permitted it.”

Furuyama leaned closer. The wound was almost invisible, a tiny red dot on the collarbone, as if someone had pressed a sharpened pencil into the flesh and found the artery with practiced precision. “Permitted it?”

“There are no defensive wounds on the hands or forearms. No bruising. The toxicology screen showed elevated levels of lorazepam in his system, but not enough to incapacitate a man of his build. He could have walked, could have spoken, could have refused.” Hasegawa pulled the sheet back further, revealing the man's face. “What interests me is this.”

She tilted the chin upward. Clipped to the dead man's tongue, like a price tag on merchandise, was a small metal clip holding a laminated paper rectangle. A number. Seven digits, black ink on white, laminated in cheap plastic. Furuyama had seen similar tags on specimen jars in university laboratories, the kind where preserved frogs and fetal pigs floated in formaldehyde, each assigned a catalog code for inventory purposes.

“Inventory number?” he murmured.

“Or a subject number,” Hasegawa replied. “This man was someone's specimen.”

The port authority had found the body at dawn, propped against a shipping container near Berth 12, arms folded, legs extended, posture unnaturally composed. No wallet. No identification. No fingerprints on file. The man had apparently existed in Yamato's bureaucratic systems only as a shadow, a ghost who collected aluminum cans and slept in doorways. The police had assigned him a case number before they had a name, which struck Furuyama as a kind of grim irony: Reiwa 7 (Wa) 249, a murder victim whose only identity was the file that documented his erasure.

Furuyama was not, strictly speaking, a police officer. He had been one once, fifteen years ago, before a corruption scandal in the Higashikai Central Division had left him as a convenient scapegoat. He had refused to implicate a senior commissioner, and the senior commissioner had rewarded his loyalty with a quiet dismissal and a black mark that made him unemployable in any reputable firm. Now he worked as a private investigator of sorts, though he preferred the term “consulting detective,” which sounded more literary and annoyed his few remaining police contacts. He took cases that interested him, which generally meant cases involving people who had fallen through the cracks of the system. The dead ragpicker, specimen number unknown, was precisely such a person.

“Mita called me,” Furuyama said, referring to Sergeant Kenji Mita, one of the few officers who still spoke to him without sneering. “He said something about this being the second one.”

Hasegawa nodded. She walked to a filing cabinet and returned with a folder, which she opened on the gurney beside the dead man's feet. “Three weeks ago. A woman, aged forty-one, found in a love hotel in Koto Ward. Same wound pattern. Same tag on the tongue.” She produced a photograph, and Furuyama studied it: a woman with dyed blonde hair, her face slack in death, a laminated tag visible on her protruding tongue. “Miyako Asano. Hostess at a bar in Kabukicho. Two prior arrests for solicitation, one for petty theft. The investigating officers assumed it was a dispute with a client. No one connected it to anything larger because no one was looking.”

“Same number?”

“Different numbers. The woman was tagged with a six-digit code. This man has seven. They don't match any known classification system—not social security, not resident registration, not medical records.” Hasegawa closed the folder. “Someone is assigning these people new identities after death. Cataloging them like library books.”

Furuyama stepped away from the gurney and walked to the small window, which looked out on a brick wall. The morning light was gray and watery, the kind of light that made the city look like a faded photograph. He was thinking about cataloging, about the impulse to organize human beings into neat rows, each with a number, each in its proper place. It was an impulse he had encountered before, in men who believed that order was the highest virtue and that those who disrupted order—the homeless, the prostitutes, the Zainam, the inconvenient—were contaminants to be removed.

“Was the woman Zainam?” he asked.

Hasegawa was silent for a moment. “Asano is a Yamato name. But the man”—she gestured at the body—“his dental work suggests dental work done in Kainam. The pattern of wear on his teeth, the materials used in his fillings. He was ethnic Zainam, probably born here but raised with connections across the strait. Or perhaps he came over during the labor migration of the sixties. It's difficult to say without more information, and we have no more information.”

Zainam. The word hung in the air like a cold draft. Furuyama knew it well because he was Zainam himself, though his grandmother had changed the family name from Park to Furuyama after the war, sanding away the syllables of their origin like a carpenter smoothing rough wood. He had grown up in a house where his grandmother spoke Yamato in public and Kainanese only behind closed doors, where the family registry was a source of constant anxiety, where the neighbors were friendly but never quite accepting. He had learned early that some people would always see him as foreign, no matter how many generations his family had lived in Yamato. It was a knowledge that settled into the bones, a low-grade fever that never quite broke.

“I need a list of every missing person reported in the last six months who matches this profile,” he said. “Elderly, homeless, Zainam, female sex workers, anyone living on the margins. The police won't have connected them because the police don't connect people like this. They see isolated incidents. Statistical noise.”

“You think there are more?”

Furuyama turned from the window. “A man doesn't develop a cataloging system for two specimens. He has a collection.”

The ragpicker's name, it turned out, was Kang Dae-hyun. He was seventy-three years old, born in a small fishing village on the southern coast of Kainam, brought to Yamato as a child during the postwar labor shortages. He had worked in factories, on fishing boats, in construction. He had married a Zainam woman who died of stomach cancer when he was fifty. He had one son, who had moved to Kainam in the nineties and never contacted his father again. For the last decade, Kang had been homeless, drifting between shelters and the docklands, surviving on the margins of a society that had used his labor and discarded his body.

Furuyama learned all of this from a social worker named Tanaka, who kept files on the homeless population around the port. Tanaka was a thin woman with tired eyes and nicotine-stained fingers, and she handed over a folder stuffed with papers without asking for any credentials.

“Kang was a regular,” she said, sitting behind a desk cluttered with half-empty coffee cups. “He came to our shelter maybe twice a month, when the weather got bad. Quiet man. Polite. Never caused trouble. A few months ago, he came in excited about something. Said he'd found a way to make good money.”

“What kind of money?”

“He didn't say exactly. Just that a university was paying people like him for some kind of research study. Memory, I think he said. They wanted to study memory in elderly populations. Paid twenty thousand yen per session.” Tanaka shrugged. “I assumed it was legitimate. Universities do studies all the time. I didn't think to ask which one.”

Twenty thousand yen was more than a ragpicker could make in two weeks. Furuyama felt a cold tightening in his chest. Someone had baited a trap with money, and Kang Dae-hyun, hungry and forgotten, had walked into it. The question was what kind of experiment required his death, and who was running it.

The Higashikai University Hospital had no record of a memory study involving homeless participants. Neither did Teito University, Meiji Medical College, or any of the other research institutions Furuyama called that afternoon. He was about to give up when a secretary at Teito's social psychology department paused on the phone, her voice hesitant.

“We don't have a memory study,” she said, “but Professor Woon's lab has been doing some kind of behavioral research. I don't know the details. It's very hush-hush. The participants are all special referrals.”

“Professor Woon?”

“Woon Ji-hwan. He's in the social psychology department. Very well-known. He does a lot of work on ethnic identity, intergroup relations, that sort of thing. He's quite famous, actually. There was a profile of him in the Asashi Shimbun last year.”

Furuyama wrote the name down. Woon Ji-hwan. A Kainanese name, though the professor might be Zainam, might be a citizen, might be something in between. The name alone told him nothing except that the man operated in the world of ethnic studies, which meant he operated in the very fault lines that Furuyama's grandmother had spent her life trying to avoid.

The second body was found two days later.

This time the scene was not a shipping container but a coin locker at Ikeburo Station, one of those cramped metal boxes where travelers stored their luggage and, occasionally, their secrets. The victim was a man in his fifties, Yoshiro Tanaka, a small-time moneylender who operated in the Zainam communities of East Ikeburo. He had been electrocuted—a thin burn mark across his chest, a cardiac arrest that was not natural. And, like the others, his tongue bore a laminated tag with a number.

Furuyama arrived at the station before dawn, watching the forensic team work in the harsh fluorescent light. Mita met him at the barrier tape, his face gray with exhaustion.

“Same killer,” Mita said. “Same tag. Same precision. This isn't random, Furuyama. Someone is hunting.”

“Not hunting,” Furuyama corrected, staring at the open locker. “Harvesting.”

He did not sleep that night. Instead, he sat in his small office above a shuttered fish market, drinking cheap shochu and arranging photographs on his desk. Kang Dae-hyun. Miyako Asano. Yoshiro Tanaka. Three people who had nothing in common except their invisibility, their marginality, and the numbers clipped to their tongues. The tags were the key—he felt it in his gut. Not just identifiers but symbols. Someone was not merely killing these people; someone was classifying them. Turning them into data points.

And data points, Furuyama knew, required a hypothesis.

He thought about Professor Woon Ji-hwan, about behavioral research and special referrals, about the university's silence when he asked about memory studies. A memory study that did not exist, but a behavioral study that did. Twenty thousand yen per session. Subjects who were poor, hungry, desperate. Subjects who would not be missed.

By morning, he had made a decision. He would need to get closer to the source. He would need to meet Professor Woon Ji-hwan.

But first, he had one more call to make—to an old contact in the Teito University registrar's office, a woman who owed him a favor from a case involving a plagiarized dissertation and a blackmailed professor. Her name was Akiko, and when she answered the phone, her voice was groggy and annoyed.

“Do you know what time it is, Furuyama?”

“I need a list of all research participants in the social psychology department for the last six months. Specifically, any study run by Woon Ji-hwan.”

There was a long pause. “That's not something I can just pull up. Participant records are confidential.”

“I'm not asking for medical records. Just names. Just to see if any of them match a list I'm compiling.”

Another pause. Then: “I'll see what I can do. But Furuyama—there are rumors about Woon's lab. The grad students talk. They say the experiments are intense. That some participants have breakdowns. That the ethics board has been asking questions but getting nowhere because Woon has connections. Big connections, in the government and the media.”

“What kind of experiments?”

“I don't know the details. Something about obedience. About authority. About how far people will go when someone in a white coat tells them to keep going.”

Furuyama felt the hair on his arms prickle. Obedience. The word was like a key turning in a lock. He had read about obedience experiments before, the old studies from the twentieth century, the ones where ordinary people administered what they believed were lethal shocks to strangers simply because an authority figure instructed them to. The studies had been controversial, ethically dubious, eventually banned. But if someone had resurrected them—if someone had pushed the boundaries further, into real harm, into real death—

“Akiko,” he said, his voice quiet. “Get me those names. As fast as you can.”

After he hung up, he stood at the window, watching the first gray light creep over the rooftops. The city was waking up, millions of people beginning their daily routines, unaware that somewhere among them walked a person who had turned murder into a research project. A person who believed that some lives were worth less than others, that some people could be reduced to numbers on a tag, cataloged and filed away like specimens in a jar.

Furuyama poured himself another shochu and did not drink it. He was thinking about his grandmother, about the way she had taught him to bow in the Yamato style, to speak without an accent, to disappear into the crowd so completely that no one would ever ask where his family came from. She had spent her life trying to make him invisible enough to survive.

And now someone was killing the invisible, one by one, and leaving numbers on their tongues.

He lifted the glass, held it to the light, and watched the clear liquid catch the dawn. The investigation had only begun, but he already knew, with the cold certainty that came from years of studying cruelty, that the numbers were counting something. And when the count was complete, whatever Professor Woon was building would be finished.

Outside, the city stirred. And somewhere in its labyrinth of streets and laboratories, the experiment continued.