After a brief period of relaxation, Asuka threw himself back into intense training. Although he possessed a powerful trump card in the form of the mutant gene pool, Asuka firmly believed that true strength had to come from oneself, so he never allowed himself to slack off.
After completing his daily physical training, Asuka stood quietly in the center of the training ground, deep in thought as he considered a new ninjutsu.
Asuka had long realized that his talent for ninjutsu was not particularly high, and whatever talent he did have seemed to be completely concentrated in his Shikotsumyaku bloodline limit. However, he was not a greedy person. Since he lacked talent in other ninjutsu, he might as well devote all his effort to researching Shikotsumyaku.
Years of research had given Asuka a profound understanding of Shikotsumyaku. Using that knowledge, he had developed many practical techniques. The "Ninjutsu: Soru" he used to infiltrate Konoha had been created in this way.
By combining the Rokushiki techniques of the Marines from his previous life with Shikotsumyaku, Asuka developed this ninjutsu, which provided linear acceleration several times faster than the Body Flicker Technique.
Now, Asuka intended to develop another new ninjutsu—one designed for long-range attacks. After all, the Shikotsumyaku bloodline limit lacked effective long-distance methods. Its existing techniques, such as Ten-Finger Drilling Bullets, were only effective at mid to short range.
Standing in the center of the training ground, Asuka raised a finger and aimed at a wooden post in the distance. In the next moment, a sharp bang echoed as a finger bone embedded itself deeply into the post, wisps of white smoke curling around it.
Asuka was not satisfied with the result. The power of a single finger bullet decreased as the distance increased. Although his attack power far surpassed that of other Kaguya clan members, it still fell far short of his expectations.
His vision for this technique was to use the finger bone as a chakra carrier, condensing a large amount of chakra within it to dramatically increase both range and destructive power—enough to instantly kill an enemy from over a thousand meters away.
The idea had existed in Asuka's mind for a long time, but he had never successfully realized it. The problem was that his finger bones could not withstand such high concentrations of chakra. Every time he injected a large amount of chakra into a finger bone and fired it, the bone would collapse midair before it could reach the target.
The reason Asuka decided to try developing the technique again was largely due to the full-body enhancement granted by the mutant ability Warpath. This enhancement not only improved his strength and endurance but also significantly reinforced his bones, making them far harder than before. As a result, his interest in the technique had been rekindled.
However, after repeated experiments, Asuka discovered a new problem. Although his current finger bones could now withstand powerful chakra, they could not effectively retain it.
Whenever a finger bone loaded with a large amount of chakra was fired, the chakra only provided a burst of acceleration at the moment of launch. The bone traveled faster and farther, but it gained no additional destructive power.
At present, the finger bone's power had been upgraded from the level of a handgun to that of a submachine gun—but Asuka's goal was the level of a Barrett sniper rifle. Clearly, the technique still fell far short of his expectations.
Asuka continued stepping backward, repeatedly testing the range of his finger bones.
While researching this technique, he hadn't relied solely on Shikotsumyaku. He had also referenced Mangetsu's Water Gun Technique. Ultimately, he hoped to achieve an effect similar to Yusuke Urameshi's Spirit Gun from Yu Yu Hakusho—immense power combined with instant firing.
After shooting dozens of finger bones, Asuka finally decided to take a break and eat lunch. Carrying his bento to the side of a small stream, he planned to catch a fish to add something fresh to his meal.
Standing by the stream, Asuka searched for a lucky fish. As he watched the flowing water, he suddenly noticed a small whirlpool forming in an inconspicuous section of the stream. Bits of grass floating downstream were pulled into the vortex and slowly dragged to the bottom.
Seeing this, Asuka's eyes lit up as inspiration struck him.
Rotation.
Yes—rotation.
In his previous life, the barrels of pistols and rifles were engraved with rifling that caused bullets to spin as they exited the barrel, increasing both accuracy and power.
The rotating vortex in the stream reminded Asuka of that principle. After hurriedly finishing his lunch, he rushed back to the training ground without delay.
Recalling the structure of rifle rifling from his previous life, Asuka began modifying his finger bones, carving spiral grooves into them with careful control. As he refined the design step by step, the new structure gradually took shape. Although nothing appeared different from the outside, the finger bone now contained a spiral internal structure.
Next came the test.
Standing at the farthest distance he had previously tested, Asuka aimed at the wooden post and fired.
The finger bone shot forward at a speed invisible to the naked eye.
Bang!
It pierced straight through the wooden post without resistance, leaving a deep hole behind.
Walking over to the post, Asuka examined the damage and rubbed his chin thoughtfully.
"It seems the modification improved both power and accuracy quite a bit," he muttered. "It's gone from a submachine gun to a rifle. But there should still be room for improvement."
Although the finger bone's power now met his basic requirements for a long-range ninjutsu, Asuka still wanted to push it further. After all, his goal remained the destructive power of a Barrett.
Through continuous testing and refinement, Asuka eventually discovered another improvement: hollowing parts of the finger bone further increased its power.
By the end of his modifications, the finger bone had taken on the shape of a sharp bullet—pointed at the front, spiraling along its entire length, with several hollowed sections in the middle.
Looking at the finished design, Asuka nodded in satisfaction.
Raising his finger again, he poured a surge of chakra into the bone and fired.
In an instant, the wooden post shattered and collapsed. The finger bone continued forward without losing momentum, piercing straight through the thick tree behind it.
At last, the power of the technique had reached Asuka's expectations.
Over the following hours of practice, he eventually refined the technique to the point where it could be fired instantly with a simple lift of his hand.
The successful creation of this ninjutsu greatly compensated for Asuka's weakness in long-range combat. A powerful ninjutsu that required no hand seals and could be fired instantly posed a terrifying threat to any opponent.
At close range, being pointed at by Asuka's finger was essentially a death sentence.
Asuka gave the technique a resounding name:
Spirit Gun.
Naturally, he shamelessly plagiarized Yusuke's move.
…
That evening, under the golden glow of the setting sun, Asuka walked home in a particularly good mood.
As he passed a dango shop, he stopped to buy a stick of tri-color dango, casually eating as he strolled down the road.
When the final dumpling disappeared into his stomach, Asuka flicked the empty wooden skewer toward a nearby bush.
Thud.
A muffled sound came from the bushes, followed by the appearance of an Anbu ninja wearing a mask. The man stepped out, clutching his left arm, which had been grazed by the skewer.
Asuka looked at him silently.
The Anbu ninja walked forward, knelt on one knee, and spoke respectfully.
"Lord Asuka, the Mizukage requests your presence at the Mizukage Office Building."
Asuka nodded slightly and turned toward the Mizukage building.
However, as he walked away, he spoke coldly without looking back.
"Next time you come to deliver orders, send someone more capable. Otherwise… next time it won't just be your shoulder that gets hit."
Cold sweat instantly drenched the Anbu ninja as he bowed his head.
Moments later, he silently disappeared.
---------------Author---------------
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