"Monster Strength Fist is ultimately just a method of utilizing Chakra. Any ninjutsu is a method of utilizing Chakra, and Monster Strength Fist is no exception," Tsunade said calmly.
"Learning it is both simple and difficult. The principle is straightforward, but it demands extremely high Chakra control—so high that even someone with Shizune's level of medical proficiency cannot truly perfect it."
Sora looked surprised. "Even Shizune can't succeed?"
"It's not that she can't use it at all," Tsunade explained.
"It's just that her Monster Strength Fist isn't perfected. When she uses it, the power doesn't fully reach the level the technique is capable of. Still, her strength increases significantly when she does."
She continued, "The principle of Monster Strength Fist is to concentrate Chakra into any part of the body, compress and ignite it, then release it in a single explosive burst.
For beginners, concentrating it into the fist is easiest. Once both fists can use it proficiently, then you can attempt other parts of the body."
Sora nodded slowly. "So I need even better Chakra control than Shizune to perform the true Monster Strength Fist."
"Correct. But even if your control hasn't reached that level yet, understanding the principle and applying it will greatly enhance your offensive power.
The stronger your Chakra and the finer your control, the greater the destructive force. The weaker they are, the less impressive the result."
As she spoke, Tsunade pulled out a scroll detailing the principles and key methods for Chakra manipulation behind Monster Strength Fist.
The theory was simple.
The execution was terrifyingly difficult.
So difficult that, in the entire ninja world, only Tsunade could currently wield it to its true maximum.
After memorizing the contents of the scroll, Sora immediately began practicing.
With a thought, Chakra surged toward his fist. It compressed, condensed and then ignited.
If someone could see through his skin, they would notice blue Chakra gathering and boiling violently inside his fist, burning rapidly as it compressed.
"Hah!"
He drove his fist into the muddy ground.
Crack!
A large fist imprint appeared instantly.
"Too weak," Tsunade said bluntly.
"But at your current level, this already doubles your strength. That's a significant increase. Practice more. In real combat, you won't have the luxury of slowly compressing and igniting Chakra."
She paused before adding, "Starting today, you'll also learn Multiple Shadow Clone Jutsu."
Sora blinked.
"Although it's a super advanced ninjutsu, it isn't difficult to learn. Once mastered, don't create too many clones two are enough.
The experience they gain from cultivation will return to you when they disperse. It's extremely beneficial. But if you create too many, the fatigue and pain returning to you will be unbearable."
This technique had been developed by the Second Hokage. As his granddaughter, Tsunade understood it thoroughly.
Sora temporarily halted Monster Strength training and focused on learning Multiple Shadow Clone Jutsu.
With his precise Chakra control, it wasn't difficult.
Even Naruto, whose control had once been terrible, managed to learn it. For Sora, it took less than a day and a half to master.
"Thankfully Mother had me train Chakra control from childhood," Sora thought. "Otherwise this would have taken much longer."
Due to his limited Chakra reserves, he couldn't squander it like a Jinchuriki such as Naruto. Dividing it evenly, he could only produce two Shadow Clones.
But that was enough.
The main body refined Chakra.
One clone practiced Monster Strength Fist.
The other trained Chakra control through Water Walking.
When both clones exhausted their Chakra—
Bang!
They dispersed into white smoke.
Sora's body trembled violently. A flood of memories and training experience surged into his mind. At the same time, intense fatigue spread through his body.
If not for years of physical conditioning, he would have collapsed.
"Now you understand the importance of a strong body and mind," Tsunade said as she treated the minor internal strain caused by high-intensity training.
Many ninja shone brightly in youth, only to decline after their forties or fifties due to accumulated internal injuries. Severe damage could permanently cap their growth.
Sora was fortunate. With Tsunade—the greatest Medical ninja—personally treating him daily, he never had to fear long-term damage.
"Mhm."
He had experienced the benefits firsthand. Every training method Tsunade designed was for long-term growth.
With Monster Strength Fist and Multiple Shadow Clone Jutsu added to his routine, Sora's days became packed.
Refining Chakra.
Practicing Monster Strength.
Physical conditioning.
Sparring with Shizune.
Improving Chakra control.
He collapsed into exhaustion daily—but the results were astonishing.
After more than a month, his Chakra intensity and quantity had officially reached Genin level.
Because of his disciplined upbringing and real combat experience, the purity of his Chakra far surpassed that of ordinary Genin.
"Hmm… Killing Intent."
Today was Tsunade's birthday. Sora had gone out alone to prepare a gift.
With his current strength, unless he encountered a Jonin or an exceptionally talented Chunin, he could escape safely. Tsunade was confident enough to let him go alone.
Ever since his first kill, Sora's sensitivity to his surroundings had sharpened drastically.
Just now, he clearly sensed Killing Intent directed at him.
The person wasn't particularly skilled—otherwise he wouldn't have detected it. At most, they were at his level.
"Kill!"
Three figures burst out from a nearby street corner. Their speed far exceeded that of ordinary civilians.
Sora's pupils contracted.
"Genin."
Three Genin.
Though the lowest rank of ninja, having three dispatched simultaneously to assassinate him was no small matter.
Since when was he worth the cost of an assassination mission?
Even Genin-level assassination missions weren't cheap.
His mind raced as the three attackers closed in rapidly—
...
Author's Note:
Naruto: Reborn as Tsunade's Son — Part 1 is now fully completed, with more than 130 chapters available on my Patreon!
You can read the completed version here: patreon.com/Shadow_demon_007
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