The Matsumoto estate documents filled three boxes, and by the time Yuna finished photographing them, her phone battery was at four percent and her eyes burned from the fluorescent lights of the storage room. She had found more than she had expected. Much more.
The folder marked "Special Tissue Acquisition" was only the beginning. Tucked behind a false back in the second box, she discovered a leather-bound notebook that old man Matsumoto had apparently kept as a personal journal. The entries were dated from 1943 to 1946, written in a mixture of formal Japanese and hastily scribbled notes that the old man clearly never intended for anyone else to read.
The entry for March 15, 1944, made her hands tremble:
Specimen 47 continues to exceed all projections. Cellular regeneration rate approximately 400% of baseline human tissue. The woman herself is unremarkable—a Goryeo subject, age estimated 22, showing signs of malnutrition and repeated trauma—but her biology is extraordinary. I have authorized the extraction of additional samples. Dr. Nishihara protests on ethical grounds, but Nishihara does not understand what we are building here. The war will end. The Empire may fall. But the biological assets we are cataloguing will retain their value indefinitely. I have begun preparing contingency arrangements with private entities that can preserve the work regardless of political outcomes.
Yuna photographed the pages methodically, her legal training overriding her revulsion. Evidence. Every page was evidence. The journal documented not just the extraction of tissue samples but a systematic plan to transfer biological assets to private corporations after the war, creating a chain of custody that bypassed any future reparations claims.
When she finished with the journal, she found the third box contained something even more valuable: a set of microfiche cards labeled "Imperial Biological Research Institute—Asset Transfer Records, 1946-1948." The cards listed coded transfers to entities she didn't recognize, but one card caught her attention. It showed a transfer of "Cell Line Series 40-49, including immortalized Line 47" to an organization called the "Yamato Life Sciences Foundation" in January 1947.
Yuna set down the microfiche and rubbed her temples. She had never heard of the Yamato Life Sciences Foundation. But she knew someone who might have.
She plugged in her phone and sent a message to an old contact: Professor Hana Ishikawa, a retired geneticist who had once testified as an expert witness in a pharmaceutical patent case Yuna had worked on during her early years at the firm. Ishikawa was in her eighties now, living in a small apartment in the northern district, and she had spent her career studying the commercial applications of immortalized cell lines.
The reply came back within minutes: Come at once. I've been expecting someone to ask about Shinsen Biotech for years.
The northern district was a different Shinwa. Away from the automated luxury of Chiyoda Ward, the streets here were older, the buildings lower, the population grayer. Elderly residents sat on stoops and watched Yuna pass with expressions of guarded curiosity. Many of them, she knew, were former industrial workers who had been displaced by automation, living on pensions that bought less each year.
Professor Ishikawa's apartment was on the fourth floor of a building without an elevator. The old woman answered the door in a faded kimono, her white hair pulled back in a severe bun. Her apartment was crowded with books and papers, and the air smelled of green tea and old paper.
"You have the Matsumoto documents," Ishikawa said. It wasn't a question.
"How did you know?"
"Because old Matsumoto was my doctoral advisor." Ishikawa gestured for Yuna to sit at a low table cluttered with scientific journals. "He trained me in cell culture techniques in the 1970s. By then he was an old man, respected, decorated. He never spoke about the war. But I found things. Notes he'd hidden. Documents he should have destroyed."
"Why didn't you expose him?"
Ishikawa poured tea with steady hands. "Because by the time I understood what he had done, I was already complicit. I had used the cell lines in my own research. I had published papers based on data derived from them. The entire field of Shinwa regenerative medicine was built on that foundation. You don't expose a single man when the entire scientific establishment is standing on the same bones."
Yuna accepted the tea but didn't drink. "What can you tell me about the Yamato Life Sciences Foundation?"
"Ah." Ishikawa's eyes grew sharp. "You have found the transfer records, then. Yamato Life Sciences was a shell organization established in 1946 by a consortium of former Imperial researchers and industrialists. Its purpose was to preserve biological assets—cell lines, tissue archives, genetic databases—outside the reach of occupation authorities and future legal claims. The foundation changed names several times over the decades. In 1992, it was acquired by a newly formed biotechnology startup."
"Shinsen Biotech."
"Precisely." Ishikawa set down her teacup. "Shinsen Biotech's founders didn't discover anything. They purchased a library of pre-existing cell lines that had been maintained in secret for fifty years. The lines were extraordinarily valuable because they exhibited properties that modern science still cannot explain—immortalization without genetic manipulation, resilience to degradation, a kind of cellular memory that persists across generations."
"Cellular memory?" Yuna thought of Zero, the creature's uncanny awareness, its reference to remembering what the cocoon forgot.
"Yes. The lines retain epigenetic markers from their original donors. Trauma markers, some researchers believe. Stress responses encoded at the molecular level." Ishikawa leaned forward. "If Shinsen Biotech has been using these lines to produce Silkworms—and I have long suspected they have—then every Silkworm carries within its cells the biological memory of what was done to those women. Not conscious memory, perhaps, but something more fundamental. A cellular inheritance of suffering."
Yuna reached into her pocket and withdrew the vial Zero had given her. The pearlescent liquid glowed faintly in the dim light of the apartment. "Zero said this was its blood. Or something like blood."
Ishikawa took the vial with trembling hands. "Where did you get this?"
"From a Silkworm. One that escaped. It called itself Zero. It told me it was made from stolen things."
"And it gave you this willingly?" Ishikawa held the vial up to the light. The liquid inside swirled slowly, as if alive. "This is extraordinary. Silkworm hemolymph—their circulatory fluid—is designed to degrade within minutes of extraction. It's a security feature, meant to prevent exactly this kind of evidence collection. But this sample is stable. Someone modified it."
"Zero modified it?"
"No. Zero couldn't have." Ishikawa set the vial down carefully. "The modification would have to be designed into the organism before decanting. Someone on the inside wanted this evidence to survive. Someone who anticipated that Zero would try to get it to a lawyer."
Yuna felt the case shifting beneath her. "You're saying there's a whistleblower inside Shinsen Biotech?"
"I'm saying you're not the only one who has been planning this case." Ishikawa stood and moved to a cluttered desk, where she began rummaging through drawers. "I have something for you. Something I've kept for thirty years, waiting for the right moment."
She withdrew a sealed envelope, yellowed with age, and handed it to Yuna. "Open it."
Inside, Yuna found a single sheet of paper bearing the letterhead of the Imperial Biological Research Institute. It was a memo dated August 12, 1945, three days before the Empire's surrender, addressed to "All Department Heads" and marked "URGENT—DESTROY AFTER READING."
The memo read:
*By order of the Director, all biological assets classified under Priority Level A are to be transferred to the Yamato Life Sciences Foundation no later than August 20. Assets include Cell Line Series 1-52, the Goryeo Tissue Archive, and all associated donor records. Destination: Sublevel 4, Jeokhwa Island Research Station. Upon completion of transfer, all original documentation is to be incinerated. Personnel are reminded that disclosure of these assets to occupation authorities constitutes treason.*
"Jeokhwa Island," Yuna breathed. "That's in Goryeo territory."
"A disputed island," Ishikawa corrected. "Administered by Goryeo but claimed by Shinwa under a historical treaty neither side agrees on. It's been a diplomatic flashpoint for decades. The research station was officially closed in 1947, but there have been rumors for years that the facility was never fully decommissioned."
Yuna stared at the memo. "If Shinsen Biotech is still operating a facility on Jeokhwa Island, they'd be in violation of at least three international agreements."
"You're thinking like a lawyer." Ishikawa smiled thinly. "Think like a corporation. Jeokhwa Island is disputed territory. Neither Shinwa nor Goryeo has clear jurisdiction. It's the perfect location for activities that would be illegal in either country. And if the facility is deep enough—sublevel four, the memo says—it could operate for decades without detection."
Yuna folded the memo carefully and tucked it into her coat pocket alongside the vial. "I need to get to Jeokhwa Island."
"That won't be easy." Ishikawa returned to her seat, her movements slow and deliberate. "The island is restricted. Access requires permits from both the Goryeo Maritime Authority and the Shinwa Coast Guard, and neither government is eager to acknowledge what might be happening there. But there may be another way."
"What kind of way?"
"There's a fishing cooperative in the southern islands. Goryeo fishermen who have worked those waters for generations. They know the currents, the patrol schedules, the blind spots in the surveillance network." Ishikawa wrote an address on a scrap of paper. "Go here. Ask for Captain Park. Tell him Hana sent you. He owes me a debt from long ago."
Yuna took the address. "What kind of debt?"
"The kind that involves a daughter who needed genetic therapy that the Shinwa healthcare system wouldn't provide to Goryeo immigrants. I arranged for treatment through unofficial channels." Ishikawa's expression grew distant. "The world we live in, Ms. Kang—the world of gleaming towers and automated convenience—is not equally accessible to everyone. The people who clean those towers, who serve the coffee and maintain the infrastructure, they come from the places the light doesn't reach. They are invisible by design. And the Silkworms are the logical endpoint of that design: labor that doesn't just go unseen but that isn't even recognized as alive."
Yuna stood to leave. "I'll contact you when I return."
"If you return." Ishikawa remained seated. "One more thing. The memo I gave you—look at the signature."
Yuna unfolded the paper again. At the bottom, beneath the typed text, was a handwritten signature she hadn't examined closely. The name was faded but legible: Dr. Hideki Shinsen.
"Shinsen," Yuna said. "As in Shinsen Biotech?"
"The founder's grandfather. The company has been a family enterprise from the beginning, though they've been careful to obscure the lineage. The current CEO, Masato Shinsen, is the third generation. He grew up knowing exactly where the cell lines came from. This isn't a case of inherited guilt, Ms. Kang. It's a case of inherited profit."
The walk back to Mokpo-dong took Yuna through streets that had transformed in the hours since sunset. The automated kiosks were restocking themselves, their mechanical arms moving with silent precision. The umbrella-drones had returned to their charging stations. Above her, the luxury towers of Chiyoda Ward glittered with the lights of apartments where Silkworms were preparing meals, folding laundry, and erasing every trace of their own existence before their owners returned home.
She thought about the women in the Matsumoto documents. Specimen 47. Age estimated 22. Showing signs of malnutrition and repeated trauma. The old man had described her biology as extraordinary, but he had not recorded her name. None of the specimens had names, only numbers and physical descriptions and notes about cellular resilience.
They had been reduced to biological assets, their suffering catalogued as scientific data, their immortality stolen and sold to the highest bidder.
And now, eighty years later, their cells were still working in the luxury apartments of Shinwa, still serving, still invisible.
Yuna reached her office and began packing for Jeokhwa Island. She didn't know what she would find there—a decommissioned research station, an active laboratory, or nothing at all. But she knew that the case file Reiwa 5 (Wa) 2 would be administratively closed within sixty-eight hours, and that whatever evidence still existed needed to be preserved before it disappeared forever.
Her phone buzzed. A message from an unknown number, different from the one that had warned her about Zero:
The island facility is still operational. Sublevel 4 houses the original tissue archive and active Silkworm production lines. They know you have the documents. They are preparing to relocate the evidence. You have less time than you think.
Yuna stared at the message. The whistleblower again, or someone pretending to be one. She couldn't trust the information, but she couldn't ignore it either.
She finished packing and headed for the southern docks, where Captain Park and his fishing boat were waiting.
The city receded behind her as the train carried her toward the coast. The automated announcements chimed in polite Shinwa-accented Japanese, reminding passengers to take their belongings and watch their step. The other passengers—mostly laborers heading home after long shifts in the service industries—dozed in their seats, their faces drawn with exhaustion.
Yuna looked at their tired faces and thought of the Silkworms, the invisible servants who never slept, never complained, never asked for wages or recognition. The ultimate labor force, designed from stolen cells to be perfectly obedient and perfectly forgettable.
She thought of Zero, its uncanny awareness, its choice to remember rather than forget.
And she thought of her grandmother, who had never told her story but whose nightmares had shaped Yuna's childhood, passing down a trauma that had no words and no resolution.
The train rushed through the darkness toward the sea, and Yuna held the vial of pearlescent blood against her chest, feeling its faint warmth through the glass.
Somewhere ahead, Jeokhwa Island waited, its secrets buried four levels beneath the surface.
Somewhere behind, the Shinwa legal machinery was grinding toward the closure of her case.
And somewhere in the tunnels beneath Chiyoda Ward, a creature called Zero was being reprogrammed to forget everything that mattered.
But Yuna Kang remembered. She remembered for all of them.
The train whistle sounded, long and mournful, and the lights of Shinwa faded into the distance like a dream dissolving at dawn.
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