Little Kosuke's Classroom

Kosuke stared at Izuna, who was fawning over him with a sycophantic smile, his eyes filled with suspicion. He didn't believe a word of it.

This guy was definitely trying to use this opportunity to spend time with his big sister!

When Izuna mentioned that he could ask Kosuke about the parts of Chakra cultivation he didn't understand, Minako, who had been shrinking away, instantly perked up.

That's right! Why didn't I think of asking little Kosuke?

Little Kosuke had always loved researching these things. She had heard Mom mention once that when little Kosuke was only three months old, he had already started scribbling and drawing on the floor.

Izuna is truly amazing! Hehehe~~

Feeling the look of admiration Minako was casting his way, the guilty expression on Izuna's face vanished in an instant. He straightened his back and nodded firmly toward Kosuke, who was staring at him in disbelief.

That's right! I came here to ask you for advice. As for exchanging insights on Chakra refinement with Mina along the way, that is part of our training!

Training! Do you even know what that is?

Looking at you, a three-year-old brat, I doubt you do.

Having witnessed Izuna's shift in expression from start to finish, Kosuke felt a wave of confusion and turned his head to see what his sister was doing.

Just then, Madara, who had been standing handsomely atop the wall, heard what Izuna said. For the first time, he unleashed the Body Technique: Body Flicker he had spent years painstakingly practicing within the courtyard of the Kosuke household.

In the blink of an eye, Uchiha Madara's figure vanished from the wall.

He appeared before the desk in the courtyard like a ghost, the hem of his clothes still trailing afterimages from his high-speed movement.

Madara crossed his arms, tilted his head slightly, and looked at the calm-faced Kosuke before him with a suspicious gaze.

"Yo~ Body Technique: Body Flicker. The King of Pretending is truly... pfft! Sorry, it just slipped out. As the most outstanding leader among our peers, your way of coming down from a wall is certainly unique."

Just as the corners of Madara's mouth were about to curl into a smirk, Kosuke's voice rang out again.

"But next time, please use the front gate. The gate to my house is plenty wide enough. Thank you."

After saying this, Kosuke stood up, turned around, pulled his big sister over, and sat down at the desk.

Then, he returned to his own seat.

Madara, his mouth still frozen halfway through a smirk, stood stiffly in place, his eye twitching uncontrollably.

Seeing his older brother's awkward state, Izuna helplessly stood up and pressed his brother down into a seat at the desk.

"Little Kosuke, do you know how to rapidly increase the volume of one's Chakra?"

The unnatural look on Madara's face froze, the tips of his ears still flushed with a faint, lingering red.

Hearing Izuna speak again, he quickly reined in his strange emotions, straightened his spine, and pressed his palms tightly against his thighs.

"Refine Chakra quickly? With a frail body like yours, you want to refine it quickly? Are you tired of being young, or do you think your life is too long?"

Kosuke frowned and turned to look at his sister beside him, seeing that her face was also filled with anticipation for Chakra.

As their eyes met, he looked at the expression in his sister's eyes, which was exactly the same as Izuna's, and his heart couldn't help but skip a beat.

In an instant, his heart sank, and his thoughts became a tangled mess—that touch of near-paranoid desire was no different from the Uchiha in his memories from his past life.

Why is it that as soon as they learn to refine Chakra, they all think about seeking rapid success?

Do they want to stand up and run the moment they learn to crawl?

Thinking of this, Kosuke's gaze sharpened, and a trace of doubt arose in his heart: Isn't it better to just stay alive? Why is everyone always thinking about such nonsense all day long? Could it be that because they are in an era of war, the children here are instilled with the concept of "getting stronger as soon as possible" from a young age?

But not everyone can be a freak like Uchiha Shisui or Uchiha Itachi in the later stages...

Although you are all Uchiha, you don't have the favor of Lord Kishimoto, so how can you soar to the heavens?

His gaze fell on Izuna at the side at just the right moment.

"You are lucky, being clearly taken care of by Lord Kishimoto."

Thinking of this, Kosuke shook his head slightly, wanting to cast all these distracting thoughts away.

Death?

When the meaning behind Kosuke's words reached Madara's ears, he narrowed his eyes slightly, and a faint aura emanated from his body, like a young beast ready to pounce.

Just then, Kosuke's voice rang out over the courtyard once again.

"Sis, don't follow this blockhead's lead. Chakra isn't something you should over-refine. If you mess it up, at best you'll be left with hidden injuries, and at worst, you'll lose your life."

"It's that serious?"

Hearing what Kosuke said, the pupils of the three of them constricted sharply.

They looked in surprise at Kosuke, who was speaking so calmly.

"Little brother, is it really like that?"

Seeing that his sister still held a glimmer of expectation, Kosuke continued: "Setting aside the question of how to quickly refine Chakra that was mentioned earlier, tell me first how Chakra is extracted."

Looking at the composed Kosuke, Madara couldn't help but mutter to himself.

Could it really be that it shouldn't be over-refined, as this brat says?

"Chakra is extracted by fusing the energy within the body's cells with mental energy."

"The body's cellular energy and mental energy?"

Kosuke's gaze swept over the three people before him, seeing all of them nod slowly.

That's right, the Chakra refinement method taught within the clan does indeed introduce it this way.

"Then have you ever thought about where the Cellular Energy and Mental Energy in your bodies come from?"

"We know. One is through food conversion, where the nutrients from food are transformed into energy within the body; this energy is usually stored in the cells. The second is cellular metabolism, where energy originates from the bio-energy produced during the activities of human cells."

"Mental Energy, on the other hand, comes from the mind, will, experience, knowledge, and emotions."

Hearing Izuna's answer, Madara nodded in satisfaction.

"Oh, is that so? Cellular Energy comes from cellular metabolism, just like the strength produced during muscle training; its essence is the bio-energy released when cells break down nutrients." Kosuke looked around at the three confused faces and tapped his fingertips on the table. "And Mental Energy is hidden within consciousness. For example, the focus when throwing a kunai or the will to survive in a desperate situation can all condense into energy."

Seeing Madara furrow his brows in thought and Izuna biting his lip, wanting to ask a question, he switched to a more common analogy: "These two energies first satisfy the body's 'daily consumption.' These two energies are like water in a bowl; you must first fill the 'bowl' that is the body, and only what remains can be scooped out to refine Chakra."

"But your 'bowls' are still growing." He curled his finger to rub his temple. "Once you enter puberty, your meridians will widen and your bloodline power will begin to awaken. The body's demand for energy will double."

At this point, Kosuke's tone dropped sharply, his gaze pinning them to their seats like a sharp blade. "If you force yourself to scoop water from the bowl at this time, the bowl will crack. Do you understand?"

Izuna's pupils contracted violently. "Just like that person in the village?"

Kosuke's gaze fell on Izuna's trembling fingertips, and he said in a deep voice, "His body energy was excessively consumed, draining the nutrients that should have been supplied to his bone development." He subconsciously traced the tabletop. "Remember: Chakra is the blade, but the hand holding the blade must be strong enough first."

"Then if there isn't enough water, just increase it, right?"

Kosuke looked at his sister, Mina, with a sense of exasperation until she sheepishly withdrew her expectant gaze.

"Sister, it doesn't work like that. Chakra is formed by fusing Cellular Energy and Mental Energy in a specific ratio, right?" Not waiting for them to react, he continued, "If you want to increase Chakra quickly, you must simultaneously increase both types of energy, but Mental Energy isn't as easy to solve as Cellular Energy."

Seeing the look in Mina's eyes, Kosuke snapped, "Don't you dare mention Soldier Pills to me! Those are strategic supplies, not something you should rely on for your daily training!"

Kosuke didn't want to continue discussing the brain-melting topic of "Chakra composition," so he turned to ask Madara, "You've been refining Chakra for two years now. Do you have any suggestions regarding the growth of your own Mental Energy?"

"The growth of my own Mental Energy?" Hearing Kosuke's sudden question, Madara fell into a brief contemplation.

He then voiced his inner speculations with a mix of doubt and certainty.

"Meditation? Thinking? Training..."

"Stop!" Kosuke's mouth twitched. He looked at Madara with a faint expression and asked in a puzzled tone, "So this is how you've spent the last two years? You didn't try asking the strong members of the clan?"

"Asking the strong members of the clan?"

At Kosuke's question, the three of them looked at each other, suddenly feeling a bit awkward.