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Konoha Year 45. The past year had moved with the relentless velocity of a sandstorm. Sayo had not grown much taller, and his frame remained dangerously thin, but the depth of focus in his dark eyes had matured into something formidable.
He had poured every available moment and every earned coin into the project codenamed "Core." The profits from his "Spider" sales, combined with the funds Sharyu painstakingly siphoned from his combat pay, had transformed into a pile of exotic components: high-purity crystals, specks of precious Chakra-conductive metal, and experimental alloys.
The Trial of Precision
The transition from theory to reality was brutal. Smelting and shaping these materials required a level of precision that Sayo's primitive home tools could barely provide. He was a master watchmaker working with a blacksmith's hammer.
He failed dozens of times.
A fraction of a millimeter's error in etching the internal resonance circuit would cause the frequency to drift, rendering the harmonization useless.
Mismatched thermal coefficients caused the delicate alloys to shatter the moment Chakra was introduced.
The micro-circulatory structure, inspired by Sasori's "Regeneration" theories, would frequently collapse under its own internal pressure.
Every failure was a financial blow and a week of lost effort. Yet, Sayo's vast spiritual energy and photographic memory ensured he never made the same mistake twice. He logged every fracture and analyzed every energy bleed, revising his blueprints with surgical coldness.
Indirect Mentorship
Throughout the process, Sayo sought "sideways" guidance. He would pose innocuous questions to Elder Chiyo about energy-circuit stability under medical load. Her answers, rooted in decades of healing and puppet mastery, provided the "biological" logic he needed for energy balance.
When structural stress defeated him, he took modified "puppet part" designs to Sasori. The youth's criticism remained razor-sharp—"Garbage structure. Three uses and it shatters"—but even his sarcasm was a roadmap. On the rare days Sasori's mood was tolerable, he would sketch an improved schematic that bypassed the laws of conventional physics, leaving Sayo to decode the brilliance hidden in the ink.
The Moment of Activation
On a cold, moonlit night, Sayo finished the final seal. He had coated the internal micro-circuits with a specialized resin laced with Chakra-metal powder to prevent energy leakage.
He drew a deep breath, condensed a wisp of his Wind-Earth Chakra at his fingertip, and fed it into the walnut-sized metal sphere.
This time, there was no crack of failing metal. The patterns on the sphere's surface began to glow with a serene blue light. The internal field stabilized, pulsing with the slow, steady rhythm of a sleeping heart. It drew in Sayo's personal energy, channeled it through the convoluted inner loops, and output a thread of utterly pure, attribute-less life energy.
Success.
It was a crude prototype with low conversion efficiency and a negligible output—nowhere near enough to power a full-scale furnace. But it was proof. The theory of Energy Harmonization was no longer a dream; it was a functioning reality sitting in the palm of his hand.
A wave of exhaustion, mingled with a quiet, profound triumph, washed over him. He gently stroked the warm casing of the Puppet Core (Mark I). The steepest ridge had been crossed.
The road ahead was still long, but in this dim, quiet room, Sayo had kindled the light of his own evolution.
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