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Time quietly slipped away amid the Puppet Workshop's orderly, fulfilling routine. Like a stream merging into a river, Sayo swiftly adapted to the new environment. His exquisite craftsmanship and keen grasp of structure soon won the approval of Third Section's members—especially Tota. The once-skeptical glances cast at his age and build gradually gave way to admiration and curiosity.
Yet beneath this outward acceptance, a deep anxiety grew daily within Sayo. The workshop exposed him to advanced Puppet Techniques, but also made him acutely aware of the chasm separating him from a true Puppeteer.
He could polish the most precise components, grasp the most complex transmissions, even etch basic runes on practice boards with minimal error. Yet when colleagues poured vast Chakra into a puppet core to drive a several-meter war-machine through intricate maneuvers, he felt the stark impotence of his own pitiful reserves. No matter how exquisite his "Spider," it couldn't change the frailty of his body. He was like a designer with a supercar brain stuck in a rusted tractor—limitless blueprints, but lacking the torque to drive them.
The Search for a Cure
He seized every chance to scour medical texts and meridian charts, searching for records on "constitution improvement" or "foundation repair." Traditional Medical Ninjutsu focused on trauma; for his congenital, root-level weakness, it offered almost nothing.
One day, watching a large puppet-energy core being tested—its violent rotation sending out vast, stable waves—an old-world memory flashed: Steve Rogers lying inside that wondrous transformation pod, an unknown energy rewriting his life-map into the Super Soldier.
"Energy… external energy infusion… transformation…" Sayo's black irises blazed.
Wasn't Chakra a universal life-energy? If micro-level Medical Ninjutsu stimulation was limited, could a macro, directional use of refined Chakra "baptize" and "reconstruct" the whole body? He cautiously asked Elder Chiyo about using a stable external energy environment to strengthen oneself.
After a long silence, the elder shook her head. "An ingenious notion. But Chakra is not source-less; it bears an intense personal spiritual imprint. Alien Chakra is near-poison; forced infusion triggers violent rejection. This path… is blocked."
The Breakthrough: The "Converter" Logic
Unwilling to quit, he approached the problem from pure energy conversion. Sasori, assembling a puppet eye, didn't even look up. "Inefficient. Abandon the impermanent body and embrace eternal puppet art—that is the ultimate way."
Two rejections. Sayo sat listlessly at his workbench, fingers tracing dust. As despair nearly swallowed him, a concept from his past life's memories flashed like lightning: The "Body Tempering Furnace."
He realized the key wasn't direct infusion—it needed a relay. A device that could take external power—Natural Energy, Tailed Beast Chakra, or multi-person Chakra—then "purify," "convert," and "harmonize" it, erasing personal imprints and turning it into neutral, primal life-energy.
"Conversion… harmonization…!" Sayo shot up, eyes wide. The "furnace" could safely, precisely infuse it into the target, mending the root and improving the constitution. It perfectly bypassed energy rejection.
The Project Begins
"The Body Tempering Furnace… yes!" Sayo trembled with excitement. A theoretical breakthrough! A crystal-clear direction blazed before him.
The technical difficulty was staggering:
Sealing Technique: For energy containment and conversion.
Puppet Technique: For the physical furnace structure and mechanical control.
Medical Ninjutsu: For safe life-energy guidance.
He knew this would be the supreme project of his life. The very first step was to design the core component—a stable Energy Core able to supply and convert power. Sayo drew a deep breath, forced down his elation, and sat again at the bench. His gaze sharpened, settling on the cold tools and parts before him.
The blueprint of his dream was drawn. Now, he would turn this fantastic concept into the light that would rewrite his destiny.
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