The so-called "dōjutsu," or ocular techniques, are essentially special physiological functions—much like how some people can wiggle their ears or fold their tongues. It's not something that can be learned through hard work alone; you must possess the innate talent.
However, relatively speaking, once individuals with such talent have experienced the sensation of activating this function, mastering the ability becomes very simple. This is because it's not a skill but a part of their own body.
Fortunately, Yūki's Stand, "Princess Kaguya," had already awakened the "Byakugan" ability first. Since he shared the six senses with his Stand, Yūki had actually experienced the state of the "Byakugan" being active many times.
With these practical experiences, figuring out how to make his own body activate the "Byakugan" naturally wasn't difficult.
Hehehe, this young master is also a dōjutsu user now.
After the meal, Yūki happily reflected on the day's events.
Diavolo was really a good guy. Not only did he help me gain combat experience and practice the Gentle Fist, but he also indirectly helped me awaken my Byakugan. He's simply a saint.
"By the way, that rogue ninja you brought back—are you planning to take his body to the underground exchange to collect the bounty?"
After finishing the meal, Hiashi asked his eldest son while drinking tea.
"Of course. Didn't the clan just find out his bounty is 15 million ryō? That's not a small amount."
Also sipping the high-quality gyokuro tea, a hint of longing for money appeared on Yūki's face.
People need money to live, whether they're high-ranking ninjas or petty traders.
The currency unit in the Naruto world is the "ryō." Its purchasing power can be gauged by the price of Ichiraku Ramen: 60 ryō for a bowl of ramen, 75 ryō for chashu pork ramen. In other words, eating three bowls of ramen a day would cost just over 200 ryō—cooking at home would definitely be cheaper.
As the main source of income for ninjas, the rewards from missions at various levels are also quite clear:
"D-rank missions" reward between 5,000 and 50,000 ryō.
"C-rank missions" reward between 30,000 and 100,000 ryō.
"B-rank missions" reward between 80,000 and 200,000 ryō.
"A-rank missions" reward between 150,000 and 1,000,000 ryō.
"S-rank missions" reward over 1,000,000 ryō.
In other words, to eat Ichiraku Ramen every day, you'd only need the reward from one or two D-rank missions to cover a month's expenses. Taking on a few higher-rank missions would make life worry-free.
From this perspective, the "underground exchange" that issues bounties is an incredibly lucrative path.
A guy like Diavolo, who was at most jōnin-level, had a bounty of 15 million ryō—equivalent to ten top-tier A-rank missions. Not to mention figures like Asuma or Jiraiya, who were worth 30–40 million—they were like walking treasuries. Of course, you'd have to be able to crack them open.
Although the Hyūga clan is a major family in Konoha, the larger the family, the more funds it needs. The Hyūga certainly wouldn't turn down an extra 15 million ryō falling from the sky—after all, it's an enormous sum that would take countless low-rank missions to earn.
How to use this money more efficiently? Well, first, send a few people to collect it.
After leaving the dining room, Hiashi quickly arranged for someone to withdraw the money from the underground exchange. Since this matter wasn't exactly honorable, it had to be done discreetly.
After lunch, it was a refreshing afternoon. Yūki went directly to the small forest where he usually trained and began familiarizing himself with his new ability.
"First..."
As Yūki focused his attention on his pupils, his originally white eyes immediately glowed, and the world he saw turned black and white.
This was the "inner world" that revealed "chakra." Observing other environments in this state wouldn't be very convenient, but if he exited this state...
Soon, Yūki changed how he used his "Byakugan." Instantly, his vision became a 360-degree field of view with full coverage—meaning he could see everything in all directions centered on himself.
So that's how it is... I see. After experimenting a few times, Yūki understood the effects of the "Byakugan."
The Byakugan, a dōjutsu originating from the Ōtsutsuki clan, excels in reconnaissance and assistance. Simply put, it has two distinct abilities:
The ability to see the chakra world invisible to the naked eye. Yūki calls this world that reveals chakra the "inner world."
The ability to visually enhance the "surface world" visible to the naked eye, providing a 360-degree telescopic field of view with no blind spots and free zooming.
It must be said that although the Byakugan's abilities aren't as flashy or powerful as the "Sharingan" or "Rinnegan," in Yūki's opinion, it is the ability closest to the origin of this world.
The "inner world" is represented by the chakra and includes all intangible things.
The "surface world" is represented by humans and includes all tangible things.
The outside and inside are two sides of a coin. Though complementary, they are distinct. Therefore, humans living in the outside world shouldn't be able to see the intangible things of the inner world. Yet, the "Byakugan" provides this ability to see what should be unseen.
Unlike the "Sharingan," which possesses various supernatural powers, and unlike the "Rinnegan," which masters the cycle of life and death, the "Byakugan" is like an observer of the world who doesn't participate in battles—resigned and independent.
"Alright, I've pretty much figured out my own Byakugan. But 'Kaguya's' is a bit different."
Thinking this, Yūki quickly summoned his Stand, "Princess Kaguya," and stared blankly at that petite, cute figure.
"?"
As if she didn't understand why her master was staring, "Princess Kaguya" tilted her head, showing a cute expression.
Right, opening my own eyes was easy, but how do I open this one's?
It was only then that Yūki realized he didn't seem to know how to make "Princess Kaguya" activate her Byakugan. After all, the previous time had been a special state triggered accidentally during battle.
"Princess Kaguya, do you know how to change your eyes like this?"
After trying and failing to make the Stand open her eyes, Yūki almost instinctively said this to her, then pointed to his own pupils, now surrounded by veins.
How could that be? She can't understand such complex instructions.
After saying this, Yūki himself laughed. After two years together, he knew that "Princess Kaguya" basically only responded to very straightforward commands like "do this" or "do that." As for something like opening her eyes, it must be—
"Mm."
But before Yūki could finish his thought, the little figure nodded as if she understood and even let out an "Mm!" sound!
What the hell!
Although it was broad daylight, Yūki felt an inexplicable chill down his spine and looked around to see if there were any other talking creatures nearby.
However, at that moment, the pupils of "Princess Kaguya" floating before him changed significantly: the light in her whitened pupils grew brighter, and veins appeared around her eyes!
No way? You can talk? Say a few more words!
Discovering that "Princess Kaguya" had activated her "Byakugan" according to his instruction, Yūki was so shocked his jaw nearly dropped.
"?"
But when Yūki tried to communicate with her again, "Princess Kaguya" shook her head, as if she didn't quite understand what he was saying.
Well, maybe I was hallucinating. But the Stand's Byakugan had finally activated successfully. However, what was the difference between her Byakugan and his own?
With a experimental mindset, Yūki switched his Byakugan to the "inner world mode" for observing chakra. "Princess Kaguya's" Byakugan also entered this mode.
But at that moment, the world in Yūki's eyes did not become the "inner world" but remained in the everyday "surface world."
Moreover, the flow of time around him began to slow down again!