Mountain Village Byakugan

"The power of the Infrasonic Radar Technique still needs improvement."

Umino Sasuke shook his head, clearly not satisfied with the result.

His original intention was to use infrasound to kill these golden croaker fish, but he had only managed to stun them and a large number of nearby fish.

The attack power couldn't be called strong; it was merely very weak. It only stunned the fish, and it also lacked pinpoint accuracy, which is why it stunned a large area of fish nearby.

"Captain, you've been going out to relax so frequently lately. Are you short on cash and planning to sell fish to pay for prostitutes?"

Tejudo said with a grin, teasing as he waited downstream, collecting the floating freshwater fish into a wooden bucket.

"Kiddo, looks like your skin is itching again, isn't it?"

Umino Sasuke kicked the river's surface, splashing a large wave of water into Tejudo's face.

The sudden wave of water caught Tejudo, who was already holding a large bucket of fish, off guard. His chakra immediately became unstable.

With a splash.

Tejudo fell into the water, flailing and yelling in panic.

"Water Release: Water Prison Technique."

Umino Sasuke quickly formed hand seals and released a relatively small binding water prison, just enough to trap the large wooden bucket that had fallen into the river, along with the fish scattered in the water.

Then, Umino Sasuke flicked his wrist, tossing the binding water prison onto the riverbank.

"Ryo, quickly fill this bucket with stones for me."

"Captain, no!"

Tejudo had just crawled out of the water when he heard Umino Sasuke's harsh words and immediately wailed.

"Kiddo, you either need to lose weight, or you need to honestly practice treading water in this river and improve your chakra control."

Umino Sasuke directed Inuzuka Ryo to hand the stone-filled bucket to Tejudo, making him continue his practice in the river.

It wasn't that he was taking the opportunity for personal revenge; it was just that this guy had probably been eating too well lately and had gotten considerably fatter.

He really couldn't see how these freshwater fish could be so nourishing. Why hadn't Inuzuka Ryo also gotten fat? Eating the same food, only Tejyuya and Xiao Xiao seemed to change day by day.

He and Inuzuka Ryo, on the other hand, had become much thinner. It seemed they were lacking in carbohydrate intake recently; it was time to switch to some millet.

"Captain, what kind of ninjutsu is that? It can actually stun fish in the water?"

Inuzuka Ryo, seeing Umino Sasuke practicing a new ninjutsu, voiced the curiosity he had felt for the past few days.

He came from a ninja clan and was quite knowledgeable, yet he had never seen such a silent ninjutsu that directly attacked the inside of objects. Although its power seemed small, it would be highly effective if used to disrupt a ninja's hand seals.

Therefore, he was very curious about what kind of ninjutsu could silently attack the interior of objects. Even advanced Wind Release couldn't be this silent, right?

"This is my Umino Clan's Earth-Shaking Secret Technique."

Umino Sasuke didn't want to say more and reveal too much information about this ninjutsu, so he passed it off as a clan secret technique.

As for how an ordinary fish-selling family could have a secret technique, it was because who among their ancestors hadn't been prosperous? Ordinary commoners couldn't pass down such things for generations. Now, which of those who could continue their lineage didn't have some noble blood?

"Mhm." Inuzuka Ryo nodded, becoming even more respectful of Umino Sasuke.

It seemed the captain's ancestors were also ninjas. Perhaps during the Warring States Period, they were an extremely secretive ninja clan, but they had declined now. Otherwise, this Earth-Shaking Secret Technique wouldn't be absent from the clan's library.

Although their Inuzuka Clan's library didn't have as many collections as the Uchiha or Senju clans, because they were intelligence ninjas skilled in reconnaissance, they had specially collected information on many ninja clans. Therefore, in terms of ninja clan intelligence, they weren't much inferior to the major clans.

Even their Inuzuka Clan had no record of the Earth-Shaking Secret Technique, so it must have been a secretive ninja clan.

As for why they declined, the ninja world's structure changed drastically over thirty years ago. The five great ninja villages were established, and a large number of ninja clans disappeared into the river of history.

It was likely that the Umino Clan also declined for this reason.

Inuzuka Ryo still had many questions, but he didn't pry further. After all, it was a clan secret technique, a topic that was usually taboo to discuss, so he continued to busy himself.

"Heh heh!" Umino Sasuke smiled knowingly. There was no such thing as an Earth-Shaking Secret Technique. It was merely a nascent ninjutsu he had developed based on research materials of tiger-type summoning beasts and his experience developing the Ultrasonic Radar Technique from water bats.

He tentatively called this nascent ninjutsu the Infrasonic Radar Technique, and the previous ninjutsu developed from the ultrasonic waves of water bats was called the Ultrasonic Radar Technique.

The two ninjutsu, based on the characteristics of infrasound and ultrasound, each had its own advantages and disadvantages.

The Ultrasonic Radar Technique, with the characteristics of ultrasound, had the advantage of high sensory precision and extremely strong insight and perception. Its disadvantage was insufficient penetration, affecting the sensory range. Chakra consumption would also increase with the density of the medium and distance.

The Infrasonic Radar Technique, with the characteristics of infrasound, had the advantage of extremely strong penetration and a very wide sensory coverage. Its disadvantage was low sensory precision; it could only mark the general location and could not identify details. As the requirement for precision increased, chakra consumption would also increase.

"It seems that for defense zone reconnaissance, the Infrasonic Radar Technique is more practical."

This Infrasonic Radar Technique was essentially a blurred version of the high-purity Byakugan, capable of large-scale reconnaissance with a radius of up to 5 kilometers.

The Ultrasonic Radar Technique, on the other hand, was essentially a low-purity Byakugan, capable of high-precision insight and perception. Its sensory range was smaller, currently limited to three kilometers. The closer the distance, the less chakra was consumed. Within a range of 200 meters, it could be fully activated like the Byakugan's perception, providing 360-degree, no-dead-angle insight into the entire battlefield.

In other words, for wide-area reconnaissance and perception, the Infrasonic Radar Technique was more practical; for close-range combat insight, the Ultrasonic Radar Technique was more practical.

"Finally, I have some sense of security."

With the mastery of these two sonic wave perception ninjutsu, especially the low-frequency Infrasonic Radar Technique, his sense of security immediately increased. The defense zone extended outward by five kilometers was all within his sensory range.

As long as he periodically released an Infrasonic Radar Technique, he could detect if any ninjas entered his defense zone.

Of course, beyond three kilometers, it could only serve as an early warning function, marking the general location without identifying details.

If he wanted to further scout and identify their specific identities, he could then release the Ultrasonic Radar Technique for more precise insight and perception.