Chapter 150: Hashirama Cells, Now Slightly Less Murderous
Their discussion slid, almost without either of them noticing, toward the stack of documents they had been orbiting for years.
Hashirama Senju's cells.
For the longest time, they had been nothing but a beautiful dead end, absurdly powerful, endlessly seductive, and utterly uncooperative.
Every route led back to the same conclusion.
The cells could survive transplantation.
And then they tried to take over.
That was the flaw.
That was also the temptation.
Power that refused to stay passive.
But now, for the first time, something had shifted.
Not a solution.
Not even a method.
Just a direction that didn't immediately collapse in on itself.
Kimimaro tapped one of the pages lightly. "These cells still don't behave like any other, or anything else we've ever studied."
Emi glanced down, eyes narrowing slightly. "Of course. They don't just adapt to a host," she said. "They try to become the host."
"Or even replace it," Kimimaro corrected. "Which is why raw transplantation always turns catastrophic. At least we know that by now."
She nodded. "Too much vitality. Too much will. They just don't know how to stop."
That was where the recently claimed White Zetsu matter came in as the game-changer.
Kimimaro turned another page, layered diagrams sliding into view.
"On their own, Hashirama cells are too aggressive."
He tapped the margin where several failure cases were annotated.
"But once they're fused with that specific strain of white tissue, something shifts. The aggression dulls. The volatility smooths out. They stop trying to dominate everything around them."
"They don't lose strength," Emi said, eyes tracking the diagrams. "They just stop fighting the host."
"Flexible," Kimimaro agreed after a brief pause. "Almost stem-like in a constructive kind of way. Enough plasticity to regulate their output instead of flooding and messing the system."
Emi leaned back slightly. "Without that step, they're basically chakra cancer. Even on paper."
"Exceptionally powerful chakra cancer," Kimimaro corrected dryly.
In the simplest terms, the fusion taught the cells restraint.
But that was only the foundation.
Their objective had never been mere transplantation.
They weren't trying to survive the cells.
They were trying to preserve everything that made the cells miraculous, while stripping away everything that made them lethal, not as a brute augmentation, but as a whole-body, balanced integration, almost as if the cells weren't being added to the body, but quietly rewriting its essence alongside it.
And White Zetsu matter on its own was never the solution.
It was only the first incision, the opening move that made everything else possible.
Emi's fingers slid to a narrow annotation along the margin, tracing it once before she spoke.
"What we're actually trying to do fundamentally," she said slowly, choosing each word, "isn't transplant Hashirama cells as they are."
Kimimaro didn't look up. "Acceptance first. Power second."
She nodded. "Yes, we want to cultivate something that behaves like them, without carrying all their inherent risks."
"Which means engineering them from the beginning," he added, "to be received by a foreign body instead of fighting it."
"That's the goal," Emi said. "So, it's not about forcing survival, but designing compatibility."
Not making universal cells.
That was impossible.
But close enough.
Chakra made generalization feasible, at least at the foundational level.
The spiritual component ensured true uniformity would never be.
"Everyone's chakra is different," Emi continued. "Even if the body accepts the cells, the spirit might still reject them."
"So parts of the process have to be specialized," Kimimaro replied calmly.
"Tailored," she agreed. "To the individual."
Which was why they needed subjects lately, for example.
"Those Jashinists have been bringing them regularly," Emi said casually. "Different physiques. Different tolerances."
"And sometimes themselves," Kimimaro noted.
She shrugged. "Ritual bodies are useful. Extreme stress tests."
The research was still largely conceptual.
Even theoretical.
But unlike a year ago, it finally had direction.
Clear steps.
Defined phases.
"Even if everything goes right," Emi said, more serious now, "grafting alone will take a very long time per person."
"So, Akane first," Kimimaro said.
Emi didn't even pause. "Yes. She also needs this the most. For her, it acts like a structural counterweight right away."
"And me after."
She nodded. "You too. You have an unusually good predisposition for it. The others wait, best case, until I can refine the tailoring further."
The papers rustled as they adjusted their positions, the discussion slipping cleanly out of theory and into logistics.
"How it would actually look..." Emi said, thinking aloud.
"Pre-engineering first. I cultivate the cells until they behave like stem analogues, but tuned. Limited growth. Controlled expression."
"With compatibility already biased toward the host," Kimimaro added.
She nodded. "Then, during grafting, I also guide them carefully in real time. Not cell by cell, obviously. But close enough."
Even for her, working like that was impossible. Instead, she would steer the process indirectly, bathing the tissue in pre-prepared Yang Release "flavors," tuned to coax acceptance, guide integration, and keep the cells from turning hostile as they settled in.
Her eyes flickered softly as she spoke, that pale glow shifting with her focus.
"These eyes changed everything," she said. "Not just that strange white creature you dragged back from wherever, but this."
She tapped a finger lightly against the page.
"Microscopic observation. Chakra down to the thread. Tailoring that chakra as a catalyst..."
"Not just for what happened before, but to push acceptance and integration in real time too."
"And a special Yin," Kimimaro said, "when things destabilize. You forgot to mention that."
"To invalidate runaway cells," Emi confirmed. "Shut them down before they cascade."
When danger spiked, she would dynamically counterbalance it with Yin suppression, freezing growth, killing cells selectively if needed.
"Backed by the latest iteration of instruments," he added, "stabilizers, monitors, everything needed to keep it from spiraling the moment something resists."
"Of course," she said lightly. "They're invaluable. And despite rumors to the contrary, even I don't enjoy gambling with my own work."
Kimimaro studied her for a brief moment before speaking. "You're still the most indispensable part of all this," he said calmly. "The best instrument we have, even after all these years."
Emi's lips curved into a small, knowing smile.
"And you're still the one who always knows where to apply the pressure."
"And you're the one who makes it real."
The words settled between them, quiet but decisive.
The papers scattered across the stone table no longer felt theoretical.
They weren't concepts anymore, or distant ambitions sketched in ink.
They felt like a countdown.
To new power.
Dangerous. Exhausting. Irreplaceable.
What they were shaping wasn't just transplantation.
It was surgery, cultivation, and battlefield control folded into a single discipline, one that had to function under pressure, inside living bodies, in real time.
From the beginning, Kimimaro had never intended this architecture to lean on science alone, not in the way it would in another world.
Science here wasn't merely underdeveloped by conventional standards.
At a deeper level, this was a world where pure methodology alone could never rule.
Chakra warped rules. Spirit interfered. Flesh remembered things it shouldn't.
Science here was incomplete by itself. And so were pure shinobi arts.
The only path forward had always been the hybrid one.
Seals instead of scalpels.
Chakra instead of chemicals.
Intent layered over anatomy.
A framework where Yang and Yin did the work that instruments never could on their own, and where true precision came not from machines, but from eyes that could see truth at the smallest scale.
Not replacing shinobi arts.
Evolving them.
Almost creating something new in the process, a branch that sat somewhere between medicine, fuinjutsu, and many others, born not from textbooks, but from necessity.
Kimimaro understood it instinctively.
In a world like this, success didn't come from forcing reality to obey logic.
It came from learning how to guide it.