Chapter 3: Teacher Mugetsu is a Good Person
After returning home, Mugetsu went to the bathroom and stuck out his tongue in front of the mirror.
As he expected, a black curse mark lay clearly visible on his tongue—the Curse Tongue Eradication Seal, a mark every Root member was forced to bear.
If he remembered correctly, this curse seal's effect prevented the user from speaking about certain topics—triggering full-body paralysis the moment they tried.
Danzo's curse, of course, was tied to secrets about himself and Root. Even if someone were captured or defected, they would be physically incapable of revealing information.
If that was all, Mugetsu wouldn't be too worried—he had no intention of leaking Root's secrets. But what unsettled him was the possibility that Danzo could manually trigger the seal at will.
That would make it a ticking time bomb in someone else's hands.
Mugetsu racked his brain, searching for any method from the original story that could break the Curse Tongue Eradication Seal.
"It seems… the only real solution is Danzo's death."
But the more he thought about it, the more he realized—no one in the original series had ever broken the seal.
Some Root members who were transferred out by the Third Hokage might've had it removed, but in most cases, it only became null upon Danzo's death.
And Danzo wasn't some squishy AD in a MOBA game who'd just die on his own in a messy teamfight.
That old fox valued his life more than anything, rarely leaving Root's underground base. For all Mugetsu knew, the man had a whole stash of revival coins hidden under his cloak.
Realizing his current strength wasn't enough, Mugetsu let go of the idea… for now.
"I'll either have to rely on Orochimaru, or figure out how to crack it myself."
In truth, only one of those paths was viable at the moment. The Orochimaru option was a dead end—for now.
Checking the time, Mugetsu activated his Sensory Ninjutsu and sensed Shisui approaching.
He walked out into the yard, thinking how Danzo seemed to trust the original body quite a lot. He'd used Sensory Ninjutsu several times already and had yet to detect any Root agents spying on him.
Sensing Shisui drawing near, Mugetsu quickly formed hand seals and burst his chakra forth in full force—releasing an enormous eight-meter-high fireball.
The fireball roared across the yard, incinerating the training dummy instantly and leaving a blackened crater of scorched earth in its wake.
At that exact moment, Shisui stepped into the courtyard—eyes wide with shock at the scene unfolding before him.
Though Fire Release: Great Fireball Technique was only a C-rank jutsu, it was favored by Uchiha Jonin for a reason.
But this—this wasn't normal.
Shisui was certain that even among the Jonin of his clan, no one could compress and ignite that much chakra into flames so quickly. The scale and intensity were far beyond anything he'd seen.
"Sensei, I'm sorry to disturb your training," Shisui said quickly after recovering his composure.
"It's fine. I was just finishing up anyway," Mugetsu smiled, exhaling as he retracted his chakra.
He invited Shisui into the house.
"Actually," Mugetsu said as he poured two cups of water, "the current situation of the Uchiha… has a lot to do with your former clan leader—Madara."
Shisui accepted the cup, his gaze steady. "I know the clan history says he left Konoha."
"If he had only left, things wouldn't be the way they are now."
Mugetsu explained that, if not for Hashirama's overwhelming strength back then, Madara might've destroyed the village himself.
Shisui fell silent.
But Mugetsu wasn't finished.
Madara's betrayal had deeply affected the Second Hokage, Tobirama. Already suspicious of the Uchiha, he became even more cautious. When he became Hokage, he enacted policies that strictly monitored and restrained the clan.
These restrictions only fueled resentment among the Uchiha's more hardline members. Some even plotted rebellion, which was eventually discovered and crushed by the Anbu.
The fallout from these events slowly buried the clan's past contributions beneath layers of fear and distrust—leading to their growing isolation from the village.
"…So many things happened," Shisui murmured. He realized now just how naive his previous understanding had been.
"There were those who tried to change that path," Mugetsu said, shifting the conversation. "Uchiha Kagami was the most successful among them."
Shisui perked up slightly.
"Then… Sensei, what kind of person do you think Uchiha Kagami was?" he asked, unable to hide the curiosity in his voice.
He had never met his grandfather in person. All he had were stories—tales of strength and genius retold over and over.
Mugetsu paused for a moment, then answered.
"An Uchiha with the Will of Fire."
"He made himself a bridge… between Konoha and the Uchiha. He bore the weight of both sides—and eased the conflict between them."
Although Mugetsu's words weren't filled with exaggerated praise, to Shisui, it was the most fitting evaluation he had ever heard.
"I also want to become an Uchiha like my grandfather," Shisui said firmly—only realizing afterward that he had directly called Kagami his grandfather.
"Grandfather?" Mugetsu looked at him, puzzled.
Shisui caught his slip, but he wasn't trying to hide it. He wasn't ashamed, nor did he feel guilty. So he admitted it openly.
"Sensei, you don't need to worry about the favor you mentioned. If you have the time, you can visit my grandfather's grave. I think he'd be very happy," Shisui said calmly.
Mugetsu nodded, then looked at Shisui with a faint smile.
"How could I not repay a life-saving kindness toward my parents? How about this—Shisui, are you willing to become my disciple?"
Shisui instantly understood what Mugetsu meant. To him, it seemed like a way for the teacher to settle a personal debt. But at the same time, he didn't want to let someone like Mugetsu—someone kind, knowledgeable, and strong—be put in a difficult position. And more than that, he truly felt that becoming Mugetsu's disciple was a rare opportunity.
After a moment of thought, Shisui nodded and called out sincerely:
"Mugetsu-sensei."
---
[Do you want to establish a master-disciple relationship with Uchiha Shisui?]
The system prompt appeared instantly, and Hayate accepted without hesitation.
This was a genius disciple he'd secured with great effort.
[Master-Disciple Relationship Established.
Current Trust Level: 2.]
[Unlocked: "Disciple Training Feedback" and "Disciple Gifting Return."]
Mugetsu skimmed the system explanation—and felt joy rising in his heart.
Disciple Training Feedback meant that as Shisui trained and grew stronger, Mugetsu would receive corresponding gains. The higher the trust level, the greater the feedback. At Trust Level 2, he would get double the benefits—if Shisui gained one point of chakra, Mugetsu would gain two.
Disciple Gifting Return meant that whenever he gave something to Shisui, the system would randomly reward him. One gift per day, with better rewards granted based on the disciple's gratitude and trust.
Mugetsu thought for a moment, then pulled out a small booklet and handed it to Shisui.
Inside was the Fire Release Chakra Nature Transformation training manual he had written that very afternoon. He had originally intended to give it later to earn more favor, but now it was time to test the Gifting Return function.
"This is a Fire Release Chakra Nature Transformation training guide I put together myself. Take it home and study it carefully. I'll be checking your progress regularly. As your teacher, I won't go easy on you—even if this started because of a favor," Mugetsu said with a serious tone.
If Shisui grew stronger, he'd grow twice as fast. Mugetsu was absolutely going to supervise that training personally.
"Thank you, Sensei. I'll train diligently."
Shisui accepted the booklet with both hands and responded earnestly.
He didn't mind the strict expectations—in fact, he welcomed them. To him, it meant Mugetsu truly saw him as a disciple, and not just a burden from the past.
---
[You gifted your disciple a Chakra Nature Transformation manual.]
[Disciple's immense gratitude triggered a critical return.]
[You have received the Fire Release: Great Dragon Fire Technique (Proficient).)
As the system rewarded him, a flood of memories filled Mugetsu's mind—vivid recollections of training the Great Dragon Fire Technique as if he had practiced it thousands of times.
Fire Release: Great Dragon Fire Technique was a B-rank Ninjutsu. Unlike the Great Fireball, which emphasized area of effect, the Dragon Fire prioritized precision and flexibility, allowing the user to control the flame freely during combat.
With enough mastery, the technique could be performed with a single hand seal—and multiple fire dragons could be unleashed at once.
Now that Mugetsu had it at Proficient level, he could instantly release three fire dragons with just one hand seal.
He looked at Shisui with newfound intensity.
No longer just a student... this boy was a walking, talking gold mine. A disciple who could generate daily rewards like a treasure chest.
Mugetsu noticed the sky outside darkening and said, "It's getting late. I'll walk you home—so your family doesn't worry."
Shisui waved his hand. "Thank you, Sensei, but I can head back by myself. I'm the only one at home right now."
Hearing that, Mugetsu paused. He recalled that in the original story, Shisui's parents never really appeared. They likely passed away not long after he was born.
He glanced at the boy and couldn't help but think, Teacher and student, both parentless. What a pair we make.
"But my uncle often visits and takes care of me," Shisui added quickly, sensing Mugetsu's concern.
Mugetsu nodded and didn't insist further. It was only their first day as teacher and student. There would be many more chances to earn favor.
---
On his way home, Shisui flipped through the training manual Mugetsu had given him. As he walked, he kept recalling the fireball he saw earlier in the courtyard. The power and control behind that jutsu had left a deep impression.
A prodigy among the Uchiha, and grandson of Kagami, Shisui had met many powerful clan members. His eyes were sharper than most.
With Mugetsu's level of strength, he shouldn't still be a Chunin. And why was someone like him teaching at the Academy in the first place?
The Academy only taught the Three Body Technique.
Something didn't add up.
---
Meanwhile, Mugetsu stood by the door, watching Shisui's silhouette grow smaller in the distance.
He couldn't help but smile slightly to himself.
Tomorrow…
He had classes in both the morning and afternoon—and was eager to see what kind of rewards the next day would bring.
Especially in the afternoon... when he'd finally get to meet Might Guy and Obito.
Just what kind of potential did those two hold?
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