(A/N: I have changed the na from Super Soldier Serum to Super Shinobi Serum. Since, in Marvel, it is called the Super Soldier Serum because it creates soldiers with "super" qualities, I felt that in this case—where shinobi are being made "super"—the na Super Shinobi Serum fits better.)
White Tiger, one of the captains of the Shadow Guard, did not hesitate even for a mont after hearing the question. Under the steady gazes of Shanks and the Uzumaki siblings, he answered imdiately, his voice firm and without doubt.
"I am willing, Lord Uzukage."
As soon as Shanks heard this, a faint smile appeared on his face and he nodded. He had personally guided the captains of the Shadow Guard—White Tiger, who now stood before him, as well as Vermilion Bird, Azure Dragon, and Black Tortoise. Because of that, he naturally wanted to see them grow even stronger.
These four positions had been nad by him, inspired by the four guardians famous in both Japanese and Chinese culture. And to these four captains—along with every mber of the Shadow Guard—he had made a promise: that he would do everything in his power to help elevate their strength further.
After all, captains were the ones with the greatest potential and combat ability. Yet at the sa ti, they were beginning to approach the limits of their growth. As ordinary humans, lacking powerful bloodlines—or, to be precise, lacking talent that could naturally break through those limits—their strength had started to stagnate. Without external help, going further would be nearly impossible.
Shanks looked at White Tiger and said calmly, "After five days, the process of the super-shinobi serum injection will be perford on you. Once the serum is injected, both your potential and your strength will receive a definitive boost."
The mont White Tiger heard this, his eyes trembled slightly. He stepped forward and bowed deeply toward Shanks, his forehead lowered in sincere gratitude.
"I thank you, Lord Uzukage, for giving such a chance."
Shanks nodded in response, his expression composed. After a brief pause, he spoke again.
"You may leave."
White Tiger straightened, gave one final respectful bow, and then turned around, leaving imdiately, his footsteps echoing faintly as he departed.
Now only Shanks and the Uzumaki siblings remained in the room. Erza looked toward him, a trace of concern in her eyes, and asked,
"Onii-san, are you certain that this super-shinobi serum you made from Hashirama's cells will be good enough for them? Or will it harm our ninjas?"
Shanks t her gaze, then slowly looked over all the Uzumaki siblings standing there. His expression was calm, unwavering.
"You don't have to worry," he said evenly. "I made sure of everything first before deciding to inject this super-shinobi serum into them. I will never risk the lives of my Uzushiogakure ninjas in so pathetic experintation."
His voice hardened slightly as he continued, the air in the room growing heavier.
"If I truly needed human specins, I could have simply ordered you to bring criminal ninjas or missing-nins from other villages. That would have been more than enough to conduct human experints." He paused for a brief mont. "But I don't want to involve myself in human experintation. Even without it, I can obtain the results I need. I have already told you all this before."
After hearing Shanks's words, the Uzumaki siblings exchanged brief glances and then nodded, their tension easing.
"Very well," Shanks said. "You all should co again after five days. That day will be recorded in history. The mont White Tiger is injected with the super-shinobi serum and successfully stabilized, my research can be considered fulfilled—and fruitful."
All the Uzumaki siblings nodded together and replied, "Yes," almost in unison. Soon after, they left to attend to their respective duties.
…
Five days later, they gathered once more in the research laboratory—this ti in a separate room where the apparatus had already been prepared. Everything was in place. Every instrunt, every seal, every gauge was ready.
The setup resembled the procedure used when Captain Arica had first been injected with his serum. White Tiger lay inside the chamber, his upper body bare, muscles relaxed yet tense beneath the surface. Slowly, the chamber closed around him, sealing shut with a dull chanical sound until it beca completely airtight.
Multiple small injection tubes filled with glowing green liquid surrounded the chamber, arranged with precise symtry. Monts later, the liquids within the tubes began to recede, their levels steadily dropping as the serum was injected directly into White Tiger's body.
The process was now underway.
Shanks stood nearby, his eyes fixed on the data streaming across the monitors. Numbers shifted, graphs fluctuated, but everything remained stable. The chamber humd softly as the system operated exactly as planned. No irregularities. No sudden spikes.
Ti passed slowly.
Finally, after an hour or so, the flow of the green liquid stopped. The machines eased into a low, steady rhythm, signalling the end of the procedure.
The process was complete.
After the injection process of the super-shinobi serum was completed and everything returned to normal—with no signs of instability—the chamber finally opened, revealing White Tiger once more. He was breathing heavily, his chest rising and falling in steady, forceful breaths. Aside from his body being drenched in sweat, there didn't seem to be any visible anomaly. It wasn't like Steve Rogers' transformation, where a weak and puny man suddenly turned into a tall, handso hunk standing over six feet. There was no dramatic external change here. His physique looked largely the sa as before.
Neither Shanks nor any of the Uzumaki siblings present had been expecting such a transformation anyway. What this serum altered was ant to happen at a cellular level, beyond what the eyes could imdiately perceive.
White Tiger slowly stepped out and finally stood straight in front of Shanks, his posture firm despite the lingering exhaustion.
Shanks looked at him and asked calmly, "How are you feeling, White Tiger? Is everything alright? Any discomfort?"
White Tiger replied without hesitation, "No, Lord Uzukage. I'm not feeling anything like that. I feel perfectly normal."
Shanks nodded once and continued, "What about your strength? What do you think of it?"
White Tiger paused briefly, focusing inward, as if sensing the flow within his body. Then he said, "I don't feel a very big difference right now, but I can tell that the chakra inside has increased by a considerable amount."
Hearing this, Shanks nodded again.
"That is definitely the case," he said. "Your chakra has increased by about twenty percent compared to before you were injected with the super-shinobi serum. But this is only the initial burst." His tone remained steady and confident. "As you continue to train and as your body adapts more and more, your strength will keep increasing. Your chakra will rise even further than this."
He then added, "You will train hard for the next month. After one month, you will spar with Antares. He will assess your progress from that point onward."
White Tiger nodded firmly and said, "I will do so, Lord Uzukage."
Shanks then turned his gaze toward Antares.
"Antares."
Antares stepped forward imdiately and replied, "I will do so, Onii-san. I will test his strength and see how much it has improved compared to before. I will observe his current growth and overall progress, and I will report everything to you."
Shanks gave a slight nod, satisfied.
----
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