Mugetsu first tested his Byakugan.
With a single thought, he activated it—instantly, the world in his eyes transford.
Even while staring straight ahead, everything behind him was also in his line of sight. This was the Byakugan's most basic ability: a 360-degree field of vision.
His sight extended far—he could clearly see a tiny bug gnawing on a leaf atop a tree five hundred ters away.
When he focused slightly, his gaze pierced through tree after tree, all the way to the visible horizon. This was the Byakugan's X-ray vision, capable of seeing through objects and even perceiving another's chakra flow.
Turning his vision inward, Mugetsu examined his own body. Under the Byakugan's penetrating gaze, he could see every single chakra pathway and every tenketsu point.
Ordinary shinobi could only release ninjutsu from the hands, feet, or mouth. But with the Byakugan, one could open every tenketsu point in the body to release chakra simultaneously.
The Hyuga clan's Gentle Fist technique, Eight Trigrams Palm Rotation, was built on this principle—activating chakra through the entire body and spinning at high speed to form a perfect spherical shield, hailed as an absolute defense.
Just having the ability to open all chakra points made Mugetsu feel the Byakugan was, at this stage, more valuable to him than the Sharingan. He didn't need the Sharingan to copy ninjutsu, nor was he skilled in genjutsu. The Byakugan's perception alone was a trendous advantage.
However, the obvious change in his eyes when using it posed a problem. For now, it would have to remain a trump card, only to be revealed when necessary.
As he thought about concealing the Byakugan, he rembered the system reward—the black-frad glasses—and realized they were far more special than he'd imagined.
[Black-frad Glasses: Conceal major changes in the head; moderately enhance intellectual temperant; once worn, they cannot fall off or be damaged unless removed by the wearer.]
The first thought that crossed Mugetsu's mind was whether forging the glasses into a weapon would make them incredibly strong—after all, the system claid they could never be damaged. But the mont after, he dismissed the idea. If they were truly indestructible, reforging them was impossible. And besides… who would use glasses as a weapon?
Deactivating the Byakugan, his eyes returned to their natural blue. He put on the glasses, then activated the Byakugan once more.
A strange thing happened. Using the reflection in a kunai, he saw that his eyes appeared completely normal—still blue—without the slightest visible change.
It didn't stop there. Even the state of his hair seed altered in the reflection; no matter how much he ruffled it, the image never looked too ssy. The change was subtle, but enough to avoid drawing attention. Of course, this effect only applied to what was seen in a reflection—in reality, his hair was still exactly as disheveled as he had left it.
Testing further, Mugetsu confird the glasses wouldn't fall off unless he removed them himself, and their durability was exactly as the system described.
Satisfied, he concluded that not only could the glasses allow him to use the Byakugan freely, but they could also protect his eyes in battle.
Now, it was ti to test his perfect-grade Lightning Breathing.
This was the first perfect-grade skill he had ever acquired. As the mories of Lightning Breathing filled his mind, he couldn't help but acknowledge its incredible strength.
Like his other two Breathing Techniques, Lightning Breathing had been adapted to fit the shinobi world.
If Rock Breathing was about overwhelming physical power—its Mark state consuming massive chakra to greatly enhance the body—
And Fla Breathing was built for Fire Release, with its Mark state turning the user into a relentless fire cannon without cooldown—
Then Lightning Breathing was a hybrid of both, offering solid physical enhancent while also boosting Lightning Release.
At the beginner level, Lightning Breathing combined Total Concentration Breathing with Lightning Release chakra nature transformation to invigorate the body, increasing physical performance while amplifying Lightning Release techniques. Once mastered, the enhancent could be maintained indefinitely in the Constant State.
At perfect mastery, the Mark state allowed the use of any Lightning Release ninjutsu without hand seals, amplified their power, and greatly increased speed, strength, and recovery.
Mugetsu could only describe it as Lightning Release Chakra Mode—enhanced. It could vitalize the body, empower lightning techniques, and grant incredible combat versatility. He had definitely struck gold.
And then ca the true gem—he finally understood the new ability that ca with mastering a Breathing Technique: the Transparent World.
The Transparent World could awaken before perfect grade, but at perfect mastery, its awakening was guaranteed.
Upon activating it, Mugetsu's control over his body reached an unprecedented peak—he could sense every blood vessel within himself, allowing him to unleash maximum power with minimal effort. His chakra control rose to an entirely new level.
But it wasn't just self-mastery—the Transparent World allowed him to see into an opponent's body, predicting their next move with precision. At the sa ti, it concealed his own presence, making it impossible for enemies to anticipate his attacks.
In Mugetsu's eyes, the Transparent World was a pure combat ability—reading the enemy while remaining unreadable himself.
"Lightning Breathing, Total Concentration Breathing!"
Mugetsu adjusted his breathing rhythm, shifting from the Constant State of Rock Breathing to Lightning Breathing. In the next mont, he perford Lightning Release chakra nature transformation, and dazzling blue arcs of electricity crackled across his body.
He pricked his arm lightly with a kunai—but the blade failed to pierce his defense.
Testing his speed next, Mugetsu found that in the Lightning Breathing state, he was already faster than when using Shave. Once he activated the Mark, his speed beca absurd. He moved so quickly that he didn't dare push himself to the limit, worried that a single burst of effort would have him crossing into Konoha's main district in the blink of an eye.
Shisui's birthday had brought him trendous gains this ti. He couldn't help but feel a spark of excitent at the thought of what future birthdays of his other disciples might bring. Still, he knew it would be difficult to match this level of benefit again—after all, he had invited every disciple to join in the celebration this ti.
That move had strengthened Shisui's trust while also boosting the goodwill of his other disciples. But it had also raised expectations. They would naturally think, "If Teacher Mugetsu celebrated Shisui's birthday, then he should celebrate mine too."
Back ho, Mugetsu activated his Byakugan once more and looked into the mirror. Just as in the kunai's reflection, his eyes showed no change.
Only then did he feel completely at ease. From now on, apart from sleeping, he might only remove the black-frad glasses when his strength was enough to sweep away all obstacles.
The next morning—Friday—he woke early as usual, this ti already wearing the glasses.
He headed first to the South Border Forest, sending out a few Shadow Clones to supervise his students' training.
"Teacher Mugetsu, why are you suddenly wearing glasses?" Obito asked, curiosity clear in his voice.
Shisui also glanced at him, equally puzzled.
"I just felt that black-frad glasses might suit well. What do you think?" Mugetsu asked with a small smile.
"They suit you, though it's a bit unusual," Obito replied honestly. "At first glance, you look like soone really smart and… well, easy to get along with."
"Indeed, they suit you perfectly, Teacher," Shisui added with a nod after a closer look.
"As long as they suit , that's good enough." Mugetsu smiled and nodded, then set off toward the Ninja Academy. Even if they hadn't suited him, he wouldn't have given up the glasses—but it was always better if they looked natural.
Upon arriving at the school office, his colleagues imdiately noticed the change.
"Teacher Mugetsu, is there sothing wrong with your eyesight?" Ikeya Yu asked.
Mugetsu gave the sa answer he'd given his students earlier.
"It makes him look more mature and intellectual—very reliable at a glance," Ueda Aya remarked, clearly approving of his new look.
"Yes… it's definitely different from before," Kimura Sugito murmured, surprised that a simple pair of glasses could create such a shift in appearance.
"Could it be…" Ikeya Yu began to wonder aloud if wearing glasses on his next date might help change his own image.
"Don't even think about it," Ueda Aya cut in, smirking. "That's because Teacher Mugetsu already has good features. Glasses won't make the sa difference for you."
"How do you know? I've never worn them before. Maybe they'd suit too," Ikeya Yu argued stubbornly.
Mugetsu simply smiled and said nothing, heading to the Class 1, Grade 1 classroom as the lesson ti approached.
The students there were no less curious about his sudden change. Children had their own unique way of describing things—they said he looked "more like an adult" now, and sohow also "easier to talk to."
Watching Mugetsu surrounded by students—especially the girls—Kotetsu leaned toward Izumo and muttered:
"Izumo, if you want to be popular with girls, it's not about earning the Hokage's approval. You have to beco a Konoha heartthrob."
"A… Konoha heartthrob?" Izumo asked, confused.
"Yeah. Soone like Teacher Mugetsu—handso, approachable, and popular," Kotetsu explained confidently.
"Teacher Mugetsu really is popular. I've heard he's well-liked by the female teachers too," Izumo admitted with a nod.
And just like that, the two resolved to learn from Mugetsu and beco "Konoha heartthrobs" themselves.
Perhaps because the black-frad glasses truly suited him, within two or three days his disciples, colleagues, and students had all grown used to them. No one stared at them with curiosity anymore.
That Friday evening, Mugetsu finalized the internship plan he had discussed with Hiruzen earlier, intending to present it for review during tutoring the next day.
However, Hiruzen seed to have been quite busy recently—Mugetsu didn't see him at Asuma's house on either Saturday or Sunday afternoon.
He wasn't concerned. There were still two months left before the sester ended, and even if Hiruzen approved it, the plan wouldn't begin imdiately.
Lately, Mugetsu had been guiding Obito toward training missions that could be linked to Kakashi. The previous mission had already been completed, and starting a new one quickly was important—after all, mission rewards were closely tied to strength growth during the period.
As for Shisui's life mission, it would have to wait. As a re Special Jonin—one specializing in education—Mugetsu wasn't yet qualified to participate. He would need to wait until Shisui grew stronger before carrying out the various operations he had in mind.
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