Her dining table was covered in printouts—research papers, data logs, screenshots of every piece of evidence she'd managed to save before her access was revoked. Her laptop sat open, three monitors she'd borrowed from her home office creating a semicircle of glowing screens. Rose's voice came through the computer speakers, analytical and tireless.
"Cross-referencing Umino family records with ReGeneLab employment database," Rose said. "Match probability for Subject Z-0 identity: 94.7%."
Yuna stood at her kitchen counter, making her fourth cup of coffee. It was 2 AM. She'd been at this for sixteen hours straight.
"What's the 5.3% uncertainty?" she asked.
"Insufficient biometric data to confirm absolute identity. The Z-0 records contain age and gender markers consistent with Shizuka Umino, but no genetic profile, no photographic identification, and no direct name linkage in any accessible files."
"Because they deleted it all."
"Correct. However, the deletion pattern itself is informative. Administrative credentials were used to purge specific data sets while leaving infrastructure logs intact. This suggests the deletion was targeted rather than comprehensive—an attempt to obscure identity while maintaining functional monitoring capability."
Yuna sipped her coffee, staring at the wall where she'd pinned a timeline:
2011 - Shizuka Umino born
2015 - Dr. Umino joins ReGeneLab
2018 - Telomerase trials begin (mice)
2019 - Human protocol development
2020 - Shizuka treatment begins (age 9, March)
2020 - Initial incident rate: 47/month
2021 - Dr. Umino attempts to withdraw Shizuka
2021 Mar - First major data deletion, Dr. Umino disappears
2021 Apr - Umino relocates to Toba as Takahashi Kenji
2022 - Second deletion
2025 (January) - Third deletion
2025 (February) - Yuna discovers Z-0
Five years. A fourteen-year-old boy had been in this experiment for five years, since he was nine.
Nine years old.
Yuna felt sick.
Her phone buzzed. A text from Naruse:
Saw your email. We need to talk. Not over text. Coffee tomorrow, 9 AM?
She typed back: Where?
That place on Harbor Street. You know the one.
The coffee shop three blocks from the ocean. Public. Neutral ground.
I'll be there.
Yuna set down her phone and returned to the screens. She'd been trying to reconstruct Dr. Umino's research from fragments—published papers, conference presentations, grant applications. Anything that might explain what he'd done and why.
"Rose, pull up Umino's last published paper. March 2019."
The document appeared: "Controlled Telomerase Activation in Mammalian Cellular Systems: A Novel Feedback Model."
Yuna had read it three times already, but she read it again. The abstract was dense, technical:
We propose a closed-loop regulatory system for telomerase activation that incorporates real-time biosignal monitoring to prevent runaway cellular proliferation. Preliminary trials in murine subjects demonstrate stable lifespan extension with reduced oncogenic risk...
Standard academic language. But buried in the methodology section, one line stood out:
Future applications may require subject-level biofeedback mechanisms to achieve optimal regulatory balance.
Subject-level biofeedback.
Meaning: the subject themselves would need to participate in the regulation. Would need to sense what was happening inside their own body and respond to it.
Which was exactly what the Z-0 data showed. Finger-tapping rhythms correlated with cardiac stability. Self-developed compensatory behaviors.
Shizuka Umino had learned to control his own telomerase activity through biofeedback.
A nine-year-old child, turned into a living closed-loop system.
"Rose, hypothesis check. If telomerase activation creates cancer risk, and external control isn't precise enough to prevent it, then the only way to make it safe would be—"
"Internal regulation," Rose finished. "The subject would need to detect precancerous cellular activity and suppress it before external monitoring could respond. This would require extraordinary interoceptive awareness."
"Interoceptive awareness. The ability to sense your own internal state."
"Correct. Most humans have limited interoceptive capacity—they can sense hunger, pain, fatigue. But detailed awareness of cellular-level processes is not naturally developed."
"Unless you train it," Yuna said quietly. "Unless you have no choice but to develop it, because your life depends on it."
She thought about the trigger log. Laughter, algae smell, wave sounds—all causing physiological responses that Shizuka had to detect and suppress in real-time.
Eight seconds from laughter to arrhythmia to resolution.
A child learning to control his heartbeat through sheer necessity.
"Rose, can you access any medical literature on developing interoceptive awareness in pediatric patients?"
"Searching... Results found. Most literature focuses on therapeutic applications—teaching children with anxiety disorders to recognize bodily states. However, one study from 2017 discusses accelerated interoceptive training in medical contexts."
"Show me."
The paper appeared on screen. Yuna skimmed it. The methodology was disturbing—essentially, inducing controlled stress responses in children and teaching them to recognize the physiological changes. The paper had been heavily criticized for ethical concerns.
The lead author: Dr. Takeshi Umino.
Of course it was.
Umino hadn't stumbled into using his son as a test subject. He'd been researching this exact approach for years. He'd developed the methodology. And when his son needed it—when Shizuka's life was at stake—he'd used it.
Yuna stood and walked to the window. The ocean was invisible in the darkness, but she could hear it. The endless rhythm of waves.
Her phone buzzed again. Not Naruse this time. Unknown number:
You don't understand what you're interfering with.
Yuna stared at the message. Then she replied:
Then explain it to me.
Three dots appeared. Typing. Then:
Some things are too important to explain.
Important to who?
No response.
Yuna set the phone down and returned to her laptop. Whoever was sending these messages wanted her scared. Wanted her to stop.
Which meant she was close to something they didn't want found.
At 9 AM, Yuna sat in the corner booth of the Harbor Street coffee shop. It was a small place, mostly empty at this hour—a few retirees reading newspapers, one student with headphones and a laptop.
Naruse arrived ten minutes late, looking tired. He ordered coffee at the counter, then slid into the booth across from her.
"You look like hell," he said.
"You're not sleeping either."
He laughed without humor. "No. Not really." He sipped his coffee, then set it down carefully. "Okay. What do you want to know?"
"Everything. Why HelixGen funds ReGeneLab. What they're actually researching. Where Shizuka Umino is right now."
Naruse winced at the name. "You found that."
"Wasn't hard. Once I knew what to look for."
"Yuna, I'm going to tell you something, and you're not going to like it. But I need you to understand—this isn't good versus evil. It's not some corporate conspiracy to hurt people."
"Then what is it?"
Naruse glanced around the coffee shop, confirming no one was close enough to overhear. "HelixGen isn't just a pharmaceutical company. They're... think of them as venture capitalists for medical technology. They fund high-risk research that could revolutionize healthcare. Telomerase control is one of their projects. If it works—if we can actually extend human lifespan safely—it would save billions of lives."
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"Billions of lives," Yuna repeated. "And one fourteen-year-old boy is acceptable collateral damage for that?"
"It's not—" Naruse stopped. Started over. "Dr. Umino's son was dying. Rare disease, no treatment options. Umino had developed telomerase activation therapy. It was experimental, dangerous, but it was literally the only chance Shizuka had."
"So Umino used his own son as a test subject."
"He saved his son's life." Naruse's voice was firm. "Shizuka should have died six years ago. Instead, he's alive. Yes, there are complications. Yes, the monitoring requirements are extreme. But he's alive."
"And where is he?"
"I don't know the specific location. That's above my clearance. But he's in a HelixGen facility, receiving the best medical care available. He's safe."
"Safe?" Yuna pulled out her phone, showed Naruse the screenshot of the Z-0 trigger log. "This is safe? Laughter causes arrhythmia. The sound of waves triggers anxiety. He can't live a normal life."
Naruse read the screen, his expression unchanging. "No, he can't. But he can live. That's what his father chose. That's what Shizuka chose."
"He was nine years old. He couldn't consent to—"
"His father consented. That's how medical decisions for minors work." Naruse handed back her phone. "Look, I understand your outrage. I do. But you're seeing this from the outside. You don't know the whole situation."
"Then help me understand. What happened to Dr. Umino?"
Naruse was quiet for a moment. "Umino couldn't handle it. Watching his son go through the treatment, the side effects, the constant monitoring. After about six months, he started questioning whether he'd made the right choice. Started talking about stopping the treatment, taking Shizuka home, letting nature take its course."
"And HelixGen said no."
"ReGeneLab's ethics board said no. Once treatment started, stopping would have killed Shizuka immediately. His body had already adapted to the telomerase activation. Withdrawal would trigger cascade failure—all his organs shutting down simultaneously."
Yuna felt cold. "So Shizuka couldn't leave even if he wanted to."
"Even if his father wanted him to," Naruse corrected. "Umino tried anyway. Tried to take Shizuka out of the facility one night. Security stopped him. There was... an incident. Umino was physically restrained. The next day, he signed a resignation letter and left. No one's seen him since."
"They forced him out."
"They prevented him from killing his son. How you interpret that is up to you." Naruse finished his coffee. "Yuna, I'm telling you this because I think you deserve to know. But I'm also telling you: drop this. Whatever you think you're going to accomplish, you won't. HelixGen has too much invested. They have legal teams that will bury you. And honestly? Shizuka is alive and stable. Going public with this won't help him. It'll just destroy the research that might help millions of others."
Yuna met his eyes. "You really believe that?"
"I have to." Naruse's voice was quiet. "My mother's care facility costs ?￥800,000 a month. Her dementia is getting worse. I take HelixGen's money to pay for that. So yes, I believe the research is important. I believe the ends can justify complicated means. Because the alternative is watching my mother suffer with no way to help her."
He stood to leave.
"Naruse," Yuna said. "If it was your son instead of Shizuka. Would you still think it was worth it?"
He didn't answer. Just walked out.
Yuna spent the afternoon at the public library, using their computers to avoid any connection to her home network. She was probably being paranoid, but paranoid was better than stupid.
"Rose, can you access ReGeneLab's server logs remotely?"
"Negative. Your employee credentials were revoked at 17:43 yesterday. I am operating on cached data only—information downloaded before your suspension. I cannot access new facility data."
"What about the deletion logs we found earlier? You said they showed upper management authorization. Can you be more specific about who executed the deletions?"
"Reviewing cached data... Yes. The deletion commands originated from user account T.Yoshida on all three occasions. This information was captured before your access termination."
Dr. Yoshida. Her supervisor. The man who'd told her to drop it. The man who'd had her access revoked.
The man who'd personally deleted evidence of human experimentation.
Yuna saved the logs to a USB drive, then deleted her browsing history and cleared the cache. Whatever she was going to do with this information, she needed to be careful.
Her phone rang. Unknown number.
She almost didn't answer. Then thought: might as well see who's threatening me this time.
"Hello?"
"Dr. Shirasaki." A woman's voice, professional and cold. "My name is Reiko Tanaka. I'm calling from HelixGen's legal department."
Yuna's stomach dropped.
"I'm calling to inform you that you've violated several clauses of your employment contract with ReGeneLab. Specifically, unauthorized access to classified research data, attempted breach of secure facilities, and retention of proprietary information after termination of access privileges."
"I haven't been terminated. I'm on suspension."
"Your employment status is pending review. However, that's not why I'm calling. I'm calling to offer you an opportunity to resolve this matter quietly."
"What kind of opportunity?"
"Sign a comprehensive non-disclosure agreement. Return all proprietary materials in your possession. Agree to cease any investigation into ReGeneLab or HelixGen research projects. In exchange, we'll provide a severance package and a neutral employment reference."
"And if I don't?"
"Then we'll pursue legal action for theft of trade secrets, breach of contract, and corporate espionage. Given the sensitivity of the materials you've accessed, we estimate damages in excess of ￥50 million. Additionally, we'll seek an injunction preventing you from working in any related research field for the next ten years."
Fifty million yen. Ten years.
They would destroy her.
"How long do I have to decide?" Yuna asked, keeping her voice steady.
"The offer expires in seventy-two hours. We'll send the documents to your registered address. Read them carefully."
The line went dead.
Yuna sat in the library, surrounded by strangers reading newspapers and students studying for exams. Normal people living normal lives.
She wasn't sure she remembered what normal felt like.
That evening, Yuna was back at her apartment when someone knocked on her door.
She checked the peephole. Dr. Yoshida stood in the hallway, alone, hands in his pockets.
Yuna debated not answering. Then opened the door.
"Dr. Yoshida."
"May I come in? Just for a moment."
Against her better judgment, Yuna let him in. He stood in her living room, looking at the makeshift workspace—the papers, the screens, the timeline on the wall.
"You've been busy," he said.
"I had time on my hands. Being suspended and all."
Yoshida picked up one of the printouts—Umino's last paper. "You found the connection. Umino, his son, Subject Z-0."
"I'm assuming you know I found it, since you're here."
"We monitor certain search patterns. When your name appeared in queries about Umino family records, it flagged our system." He set down the paper. "Yuna, I came here to tell you something I probably shouldn't. But I think you deserve to know."
"Know what?"
"I was there. When Umino brought Shizuka in for the first treatment." Yoshida's voice was quiet. "The boy was dying. Organ failure was beginning. We had maybe two weeks before it would have been too late. Umino begged us to start the protocol. He'd developed it specifically for this—for his son."
"And you said yes."
"The ethics board reviewed it. Experimental treatment on a minor, but with parental consent and no alternative options. We approved it." Yoshida looked at the timeline on Yuna's wall. "The treatment worked. Shizuka's condition stabilized. His organs began regenerating. Within three months, he was healthier than he'd been in years."
"But?"
"But the side effects were worse than we anticipated. The sensory triggers, the cardiac events, the constant need for monitoring. Shizuka developed extraordinary self-awareness out of necessity—he had to, to survive. But that awareness came at a cost."
"What cost?"
"Imagine being a child and knowing that laughter could kill you. That the smell of the ocean could trigger a panic response your body can't distinguish from an actual threat. Imagine living every moment monitoring your own heartbeat, your own emotional state, because a moment of inattention could mean death."
Yoshida sat on her couch uninvited. He looked old, suddenly.
"Umino couldn't bear it. He'd saved his son's life, but he'd turned him into... something else. Something trapped between human and medical experiment. He wanted to stop. But stopping would have killed Shizuka instantly."
"So you deleted the records. Made it classified. Hid the evidence."
"We protected Shizuka's privacy. Can you imagine what would happen if this became public? The media circus, the ethical debates, the protesters? Shizuka would never have a normal life. He'd be a symbol, a case study, a controversy. We thought—I thought—keeping it confidential was protecting him."
Yuna studied Yoshida's face. He seemed sincere. Tired. Burdened.
"Where is Shizuka now?"
"He's safe. He's cared for. And before you ask—yes, he knows his situation. He's fourteen, not a child anymore. He's aware of what happened to him. He's aware he can't leave the monitoring environment. And as far as I know, he's accepted it."
"Have you asked him if he wants to be a secret?"
Yoshida stood. "I came here to give you context. To help you understand that this isn't a simple story of corporate villainy. It's a tragedy with no good answers. Umino made an impossible choice. We're trying to honor that choice while developing technology that could save millions."
"And if I don't sign the NDA?"
"Then HelixGen will destroy you. Legally, financially, professionally. I don't say that as a threat—just as a fact. They've invested too much to let this become public." He walked to the door, then paused. "But I'll tell you something else. Something I haven't told anyone."
"What?"
"The deletion on January 15th—the most recent one. I didn't execute it."
Yuna's breath caught. "But the logs—"
"Someone used my credentials. I was at a conference in Osaka. I didn't discover the unauthorized access until three days later. By then, the files were gone."
"Who?"
"I don't know. But it means someone else knows about Z-0. Someone with enough access to use administrator credentials. And they're covering tracks that I didn't even know needed covering." Yoshida met her eyes. "So be careful, Yuna. You're not just fighting HelixGen. You're fighting something inside ReGeneLab that even I don't fully understand."
He left.
Yuna locked the door behind him, then stood with her back against it.
The deletion logs. T.Yoshida's credentials. But not T.Yoshida.
Someone was using his identity to hide evidence.
Someone who knew about Shizuka Umino.
Someone who was still there, still working, still watching.
At midnight, Yuna made a decision.
She couldn't sign the NDA. Whatever HelixGen threatened, she couldn't agree to silence.
But she also couldn't go public—not yet. Not until she understood the full picture. Not until she could prove what had happened without just being dismissed as a disgruntled ex-employee with stolen data.
She needed to find Shizuka Umino.
Talk to him. See him. Know what he wanted.
Because everyone else in this—Yoshida, Naruse, HelixGen, even Dr. Umino—they'd all made choices about Shizuka's life.
No one had asked Shizuka what he wanted.
Yuna opened her laptop.
"Rose, I need you to do something that might get both of us in trouble."
"Clarify."
"I need you to track real-time data streams from ReGeneLab's network. Specifically, continuous biosignal monitoring. The kind that would be generated by someone like Z-0."
"That would require accessing protected medical data systems. It is illegal under multiple statutes."
"I know."
A pause. Longer than usual.
"Rose, you can refuse. I won't—"
"I am not programmed to refuse requests from my primary user. However, I am programmed to warn you of consequences. If detected, this action will result in criminal charges."
"Noted. Can you do it?"
Another pause.
"Yes. Beginning trace protocol now."
The screen filled with data streams. Network traffic, encrypted channels, server handshakes.
And then, after three minutes: a match.
Active Data Stream Detected
Source: HelixGen Coastal Medical Facility
Stream Type: Continuous Biosignal Monitoring
Subject ID: Z-0
Current Status: ACTIVE
Signal Strength: Strong
"Rose, can you pinpoint the location?"
"Triangulating based on network routing... Location identified. HelixGen Coastal Medical Facility, Mie Prefecture coastal region. Approximately 200 kilometers northeast of ReGeneLab. The facility is listed as a private research clinic in public records."
Two hundred kilometers. Four hours by car, crossing prefecture lines.
Yuna stared at the address on her screen.
She could go there. But not tonight. The journey would take her through mountains and along coastline, and she'd need daylight.
But then what? Knock on the door and ask to see their secret human test subject?
No. She needed a plan. She needed to think.
But at least now she knew.
Shizuka Umino was real. He was alive. He was two hundred kilometers away, across prefecture lines, in a facility designed to keep him hidden.
And tomorrow, Yuna was going to find him.
- KAZUYA OKAMOTO
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