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At the Land of Rivers frontline main camp, the air was thick with the heavy scent of blood, medicinal herbs, and a feeling of oppressive exhaustion. The news that the Sandstorm Squad was almost completely wiped out did not cause much of a ripple; in this massive meat grinder of war, the casualties of a single squad were far too common. But for Sayo, standing amid the bustling, busy camp, he felt an unprecedented sense of loneliness.
Captain Iryō was sent into the severely wounded tent. His right wrist had undergone emergency treatment, saving his life, but his ninja career had, as Sayo expected, come to a complete end. Xu was arranged to rest, but her eyes still held the terror of those scarlet Sharingan pupils.
One dead and two injured. The once highly coordinated squad now had only Sayo remaining at full capacity. However, the Great War was reaching a fever pitch, and Sunagakure had no time for sorrow. Soon, an order arrived from Elder Chiyo's office.
"Chūnin Sayo!" The adjutant's expression was grim. "Given your Medical Ninjutsu capabilities and the extreme shortage of personnel, you are temporarily requisitioned to report immediately to the Field Hospital! Do not delay!"
Sayo accepted without hesitation. He visited Iryō and whispered to the taciturn Xu, "Wait for me to return," before walking toward the area where the wailing was loudest.
The Field Hospital: A Different Battlefield
The Field Hospital was a chaotic collection point for the horrific reality of war. Tents stretched endlessly, filled with casualties suffering from severed limbs, Scorch Release burns, and ruptured internal organs. A medical Jōnin simply asked about Sayo's abilities before pointing him toward a tent for moderate injuries.
"Focus on stopping bleeding and stabilizing conditions. Mark the severely wounded and move on! Hurry!"
There was no time to adjust. Sayo threw himself into the work. He crouched before a ninja whose abdomen had been sliced by a Wind Release blade. A soft green light glowed from his hands—the Healing Jutsu (Shōsen Jutsu).
Initially rusty, the calm logic of his previous life as an engineer soon took over. He treated wounds with surgical precision, calculating chakra consumption to achieve the maximum effect with the minimum output. Day after day, he sensed the texture of every muscle and the path of every meridian. He witnessed the fragility of life and its tenacity, dragging some back from the brink while watching others fade.
The Field Hospital became his new battlefield. While physical exhaustion could be relieved, the mental drain was immense. Even with the foundation of the Natural Energy Body Tempering Furnace, the high-intensity output placed a heavy burden on his body.
A thought became clear: he needed a more efficient, portable energy source. The current furnace was too large. It had to be miniaturized.
During his rare breaks, he began sketching a new design. He imagined a device the size of a watch.
The "Dial": A display and control interface for energy flow.
The "Case": Integrating a miniaturized Spirit Siphoning Seal and a Natural Energy conversion unit.
The "Strap": Acting as energy output contact points to continuously nourish the wearer's body and purify fatigue.
This was an extremely difficult concept involving the limits of Fūinjutsu and precision manufacturing. But Sayo, now intimately familiar with human anatomy through hundreds of surgeries, had a challenging gleam in his eyes.
In a quiet corner of the wailing hospital, a design that might change the future was being conceived.
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