In the traditional sense, "Sensing Ninjas" are mostly naturally gifted Ninjas who possess "pure spiritual power"—not necessarily powerful, but pure. This purity represents a sensitivity that allows them to hear the vibrating sounds of the meridians as if they were strings, giving them a wider range of perception than ordinary people. They also possess "meridians sufficient for detection"—and this point is even more crucial!
The way a person's meridians grow is constrained by their innate bloodline. It's like a person; no matter how good their nose is, it will never compare to a dog or a pig because their physiological range of reception is simply different.
If a person's spirit can be trained later in life—like the ordinary Ninjas in Konoha's Sensing Squad or Barrier Team—then with a bit of talent and hard work, they can reach the level of a qualified Sensing Ninja.
However, the nature of one's meridians is innate. At least until Ino, no one had a method to train them—
The execution and use of Ninjutsu itself can passively train the meridians. But if this kind of training lacks focus and an understanding of the principles, the result might be turning a harp string into a thick, hard steel wire. Never mind feeling the vibrations of the wind... even if a Kunai were to strike it, if the steel wire only twitched slightly, it would be considered insufficient training... Chakra Sensing:
This ability, which isn't inherently magical, varies from person to person because of the differences in meridian sensitivity.
Ino is among the best of the best—born into the Yamanaka Clan, which specializes in sensing, and specifically into the family of the clan head, where Sensing Ninjutsu is strongest and the bloodline is purest. While Mrs. Nobuko was slightly less gifted, her ability in Sensing Ninjutsu was still among the best in the clan.
Furthermore, she created her own training methods of Kneading, Stretching, and Shaking to exercise her meridians, even using the Slippery Pulse method to experience every note within them.
This kind of "talent" combined with her own "hard work" gave her an extremely sharp, almost unbelievable level of Chakra insight.
Of course—relying on the sensitivity of one's own meridians isn't the only way; the Ninja World has plenty of "cheat" methods:
For instance, even if one's meridian sensitivity is insufficient to sense those subtle ripples, it doesn't stop some people's eyes from acting as amplifiers. These eyes can magnify all Chakra changes within a radius of over ten kilometers. At closer ranges, the Chakra vibrating from the meridians even becomes clearly visible.
This—is the Byakugan.
A tool of immense strategic significance that can make the entire battlefield "transparent," the Hyuga Byakugan essentially gives Konoha a one-sided vision cheat.
Individual Ninjas with the Byakugan might not be powerful—but once they appear on the battlefield, they are undoubtedly the most terrifying enemies.
It's like a group of blind people fighting, and suddenly one of them gains eyes and can see the others' movements clearly. At that point, even if the person with eyes is physically weak, they can easily remain undefeated. During the Third Great Ninja War, the Hyuga Clan could be said to have performed exceptionally meritorious service.
The reason the "Caged Bird" is tolerated is also inseparable from such achievements—talents with special value can always be treated specially.
Nana and Kana's own meridian sensitivity was much lower than Ino's, and their spiritual strength was also far behind. Moreover, they hadn't been practicing the Chakra Three Methods taught by Ino for very long.
Furthermore... they weren't like Ino, children in their growth phase like inflating balloons; their bodies were already set from the inside out. Trying to make a breakthrough in their meridians now was actually a very difficult task.
"Keep it up, you can definitely do it. Have a little more confidence in yourselves... After a while, I'll do some more research into our family's Sensing Ninjutsu..."
Ino comforted the two of them, saying something quite remarkable in a casual tone—as if the family's Sensing Ninjutsu was something she could just research on a whim.
Arriving at a grilled squid stall, they each ordered a portion. As they ate, they listened to the others' letters of repentance.
The "letters of repentance" from these people were clearly written with much more depth—
They had truly realized their mistakes inside the small rooms of the Public Security Division. One by one, they honestly acknowledged the potential harm and chaos that spreading rumors could cause Konoha Village, the injury to others, and their own lack of responsibility. They also recognized the errors at the root of their thinking—explaining why they started the rumors and how the ideas came to be... Hearing such soul-searching self-reflections for the first time, the old woman transformed from the Sandaime was already dazed... Sure enough, by comparison, his own self-reflection was truly inadequate.
The group of women below also listened thoughtfully. It was the first time they clearly and explicitly understood how a person's thought process worked and how rumors were actually generated.
Mrs. Nara held Nara Shikamaru's hand, listening with great interest. She thought to herself, "This is a good method. I'll use it on that lazybum later... I must dig deep into the root of his chronic laziness." Then, looking down, she immediately saw Nara Shikamaru, whom she was holding—he looked like he was carved from the same mold as his father, even their hairstyles were the same.
Why not... try it out on this boy first? Only five years old, yet he's lethargic all day with no energy, interested in nothing. If he's not lying down basking in the sun, he's lying down basking in the sun... He was only dragged out of the house today by force... Shikamaru instinctively shuddered and happened to see Ino eating grilled squid. The boy looked as if he had seen a savior.
"Mom, it's Ino..."
..."Ino? Are you out with your mother?" Mrs. Nara looked in the direction Shikamaru was pointing and saw Ino with Nana and Kana. She thought, "So she came out on her own..."
In her heart, she was quite disapproving of Inoichi Yamanaka and his wife's "doting." She thought, "Who spoils a child like this? Even having two maids follow her..." As for the maids' bodysuits, Mrs. Nara didn't pass judgment—they were Ninjas, after all, and there were plenty of people in eccentric clothing. Konoha had no shortage of strange outfits, and many were far weirder than this.
Mrs. Nara led Shikamaru over and asked Ino, "Little Ino, why are you out by yourself? Where's your mother? Didn't she come with you?"
"I always go shopping by myself... It's no fun with Mom. She likes to browse the stores, and I don't..."
"Oh, I haven't seen you for a few days, and Ino is getting prettier and prettier."
"Auntie, are you bringing Shikamaru to join the fun?" Ino tilted her head and asked intentionally, "Shikamaru is so lazy, how could he come out of his own accord?"
"He can't just lie at home every day, doing nothing but basking in the sun. I'm afraid he'll grow mold from being too lazy, so I dragged him out for a walk... Ino, why don't you join us!"
Mrs. Nara was very responsible—
Since Mrs. Yamanaka wasn't around and Ino had run out on her own, meeting her meant she had to take on at least some responsibility for looking after her.
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