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Dusk in Sunagakure painted the swirling sandstorms in hues of molten gold and bruised purple. Sayo's small figure moved through the quietening streets with practiced ease, turning onto the secluded path that led to the hidden temple.
Inside, the oil lamp flickered like a lonely heartbeat. Monk Bunpuku sat upon his simple cushion, a gentle smile creasing his weathered face. "You've arrived, Sayo."
"Great Master." Sayo nodded and took his place. His gaze drifted to the intricate sealing formulas inscribed upon the old monk's abdomen. He could "feel" the turbulence today; the inhabitant was restless.
[Hmph! Brat, you've come to disturb my peace again!] A sharp, hoarse voice vibrated directly within Sayo's mind—Shukaku.
Sayo replied internally, his tone dry: "Don't you complain about being bored all day? I'm here to keep you company, and you're still grumbling?"
[Tch! Who needs your company! I am the noble Ichibi, not a playmate for a bean sprout like you!] Shukaku retorted, but Sayo sensed no true malice—only a guarded, prickly expectation.
"Sayo," Bunpuku began, interrupting the silent dialogue between the boy and the beast. "Today, we study the core rune structure of the Four Symbols Seal. It is an architecture of balance—the intersection of space and energy."
The old monk dipped his finger in water, tracing complex lines upon the stone floor. Sayo's mind, a high-performance processor, recorded every turn. He watched how the water tension mimicked the flow of Chakra through the runes.
[Tch, the Four Symbols Seal? Shallow!] Shukaku snorted. [I have seen Ancient Seals from before your history was written. The Adamantine Sealing Chains that can draw directly upon Natural Energy—now that is art...] The beast stopped abruptly, as if it had let a secret slip.
Natural Energy. Sayo's heart hammered. The term echoed concepts of "Sage Transformation" he vaguely recalled from his previous life. He didn't press; he knew dealing with the "tsundere" raccoon required a soft touch. He simply filed the data away.
When Sayo left the temple, he carried more than just the Four Symbols blueprint. He had several obscure Barrier Runes that Shukaku had "accidentally" leaked.
He detoured toward Elder Chiyo's house for his scheduled medical study. To his surprise, Sasori opened the door. The young genius looked as indifferent as ever, stepping aside to let Sayo pass.
"Granny Chiyo is at a Council meeting," Sasori said flatly. "The medical scrolls are in the study. Don't touch anything else."
"Thank you, Senior Sasori." Sayo moved toward the study, but his eyes were magnetically drawn to a puppet arm on Sasori's workbench. It was a masterpiece of internal engineering. Flexible metal sheets replaced rigid joints, and the Chakra-Conducting Wires were woven in a non-linear pattern.
Sasori noticed his obsession. "Can you understand it?"
Sayo suppressed a gasp, pointing to the connections. "The metal sheets... they act as leaf springs to absorb impact force. And this circuit—it bypasses the primary nodes to reduce impedance. It's a high-speed bus."
Surprise flashed in Sasori's purple eyes. He picked up a tool, adjusted a gear by a fraction of a millimeter, and spoke: "The standard circuit has a 0.3-second delay. This modification reduces it to 0.1. In our world, the difference between life and death is that 0.2-second gap."
The sentence struck Sayo like a lightning bolt. Optimization. The mechanical efficiency of his past life was the lethality of this one.
After collecting the scrolls on Human Meridians, Sayo practically floated home. Lying in the darkness of his room, the disparate pieces of his life began to resonate.
The Body: A defective biological engine.
Chakra: The high-density fuel.
Puppetry: The mechanical extension of function.
Sealing: The low-level "machine code" that governs energy flow.
"What if..." Sayo whispered to the shadows, his pulse quickening. "What if I build a 'Internal Furnace'? I use Sealing and Barriers to form the core logic, Puppet structures to create reinforced energy circuits within my own body, and Medical Ninjutsu to ensure the tissue survives the load..."
It was a madman's blueprint. It was the birth of Shinobi Cybernetics.
The night was long, and for the first time, the transmigrator saw a way to not just survive the desert, but to become its master.
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