"Whoosh—"
Inside Ren's room.
Aside from Ren's main body sitting motionless in meditation—
"Shizune" was also sitting cross-legged opposite him, her eyes closed.
"Shizune-senpai, next I'll synchronize my chakra and adjust it so that it matches the type of chakra you can use. Then I'll begin condensing the Yin Seal. Make sure to carefully feel every detail…"
With Shizune's own chakra alone, directly forming the Yin Seal was obviously impossible to accomplish in just a day or two.
If they wanted to achieve it quickly, they needed the vast chakra reserves that Ren himself possessed.
Normally, converting one's own chakra and transferring it for someone else to use was something ordinary people simply couldn't do.
But with Ren's extremely precise chakra control, it was completely achievable.
"Mm. Ren, go ahead and do it!"
Inside the spiritual world, Shizune concentrated intensely on sensing the flow of her chakra and every subtle change in her body, discarding all distracting thoughts.
She was afraid of missing even the slightest detail.
She sincerely wanted to master the Yin Seal and the Strength of a Hundred Technique.
Because of her limitations in talent and aptitude, even though Tsunade had taught her wholeheartedly and she herself had worked tirelessly—gritting her teeth, afraid of disappointing her teacher—
her results had always been limited.
She hadn't been able to inherit Tsunade's mantle.
Because of that, Shizune carried a certain degree of inferiority and guilt.
She didn't even dare to proudly declare herself the disciple of Tsunade, the legendary medical master.
Only after Tsunade later accepted Ren and Karin as disciples did she feel as though a heavy burden had finally been lifted from her shoulders.
She became much more relaxed.
But seeing how her junior brother and sister were both astonishing geniuses, far surpassing her—
although Shizune wasn't the type to feel jealousy—
she still couldn't help feeling somewhat disappointed deep inside.
She simply buried those feelings without showing them.
During these two years, she had frequently asked Ren questions about chakra control without any shame, privately training tirelessly and never stopping.
That alone spoke volumes.
Now that such an opportunity had appeared, she naturally didn't want to let it slip away.
"Whoosh—"
Within the complex chakra network of the human body,
Ren's vast chakra continuously transformed into chakra synchronized with Shizune's own.
Especially the astonishing vitality contained within it—
which nourished her body.
"Ah~!"
The sensation made her feel incredibly comfortable, to the point that she almost let out a soft moan.
Realizing it instantly, her face flushed bright red.
"Senior Sister, next I'm going to try expanding your chakra pathways so you can control your chakra more easily and allow it to flow more smoothly. That might allow your chakra control to improve even further…"
Ren's eyes displayed the crimson pattern of the Mangekyō Sharingan.
Combined with the unique perception of the Spirit Transformation Technique, he carefully observed Shizune's chakra network.
Feeling the huge differences between her chakra system and his own, a bold idea suddenly formed in his mind.
"What do you think?" he asked.
"Eh? Something like that… is actually possible?"
Forgetting her embarrassment, Shizune was astonished.
"Normally it can't be done from the outside," Ren explained. "But with the Spirit Transformation Technique and your cooperation, if I expand and repair the pathways from the inside out, it should theoretically be possible."
"Of course, if it were anyone else, they wouldn't have the medical skills to succeed. One mistake could damage the chakra network and potentially cripple the person."
"But the process might be a bit painful. Can you endure it?"
Previously, Ren had discussed this topic with Tsunade.
A person's chakra control didn't depend solely on the structure of their chakra pathways.
Their spiritual strength also played a major role.
While this method couldn't raise Shizune's chakra control to Ren's exaggerated level—nor even to Tsunade's level—
carefully clearing and widening the slightly congested chakra pathways in her body through delicate medical ninjutsu could theoretically improve her control.
That might greatly accelerate her progress in mastering the Yin Seal and the Strength of a Hundred Technique.
"Then… Ren, go ahead!"
Inside the spiritual world, Shizune's expression shifted.
But in the end, she gritted her teeth and agreed.
As an excellent medical ninja, she naturally understood how important the chakra network was.
If it were damaged, the consequences could be severe.
She might even become crippled.
But because she trusted Ren, she made up her mind.
"Then bear with it…"
Ren didn't say anything more.
He immediately began.
Using his precise chakra control, he forcibly widened the slightly obstructed pathways in her chakra network.
At the same time, he used the powerful vitality of his chakra along with the Mystical Palm Technique to repair any damage.
Such an outrageous method was impossible for ordinary people.
Even Tsunade herself wouldn't be able to do it.
But Ren had already inherited all of Tsunade's medical knowledge and gradually integrated it into his own foundation.
Combined with his exceptional medical ninjutsu and chakra control—
he could accomplish it.
"Ah… ah…"
Inside the spiritual world, Shizune's face turned pale from the pain.
The sensation was intense.
But she clenched her teeth and endured it.
Fortunately, the pain wasn't enough to make someone lose their mind.
At the same time, she was deeply shocked.
So this is Ren's chakra?
Warm.
Powerful.
Overflowing with vitality.
Time passed little by little.
The entire process lasted one full hour.
Finally enduring it all, Shizune let out a breath of relief.
"Phew… it's finally over!"
"The effect is pretty good. The chakra flow is indeed much smoother now."
Controlling Shizune's body, Ren felt the chakra moving through her network and smiled.
"Yes… I can feel it too. Thank you so much, Ren!"
Shizune was delighted.
Under Ren's unbelievable technique, her chakra control had clearly improved.
Compared to that, the earlier pain was nothing.
"Alright, get ready. I'm going to start condensing the Yin Seal."
Ren wasted no time.
His hands rapidly formed seals.
He began forming the Yin Seal for Shizune.
"I'll do my best!"
Shizune immediately focused.
She carefully sensed the flow of chakra and every subtle change in her body.
She had already memorized the training method for the Yin Seal long ago.
She just hadn't been able to succeed.
Now she could clearly feel the chakra in her pathways continuously gathering toward her forehead.
Ten minutes passed…
Half an hour passed…
Three hours passed…
Because it wasn't his own body, condensing the Yin Seal took Ren considerable time.
It took four full hours.
Finally—
a genuine Strength of a Hundred Seal appeared on Shizune's forehead.
She could clearly sense that within the dark spiritual space, a mysterious pool had formed.
Chakra continuously flowed in from her pathways like small streams.
Gradually gathering inside it.
If not for Ren's enormous chakra reserves, her body might have been completely drained—she wouldn't even have been able to perform medical ninjutsu afterward.
"It's done."
"The Yin Seal has been fully completed. The 'pool' already contains a certain amount of chakra, and the seal has stabilized."
A diamond-shaped mark had appeared on "Shizune's" forehead.
"Shizune" smiled.
"From now on, Senior Sister, you need to keep familiarizing yourself with the Yin Seal and the Strength of a Hundred Technique, and practice injecting your own chakra into it."
"When there's time, I'll enter your body again and repeatedly use the techniques so you can experience them firsthand. That should help you master them faster."
"Mm! That's wonderful. Thank you, Ren!"
Shizune was overjoyed.
Having personally experienced the entire process of forming the Yin Seal and the Strength of a Hundred Seal, she felt suddenly enlightened.
Even without Ren's help now, she believed that if she kept practicing diligently, she would master this power within a year or so.
"It's the least I could do…"
Inside the spiritual world,
seeing Shizune's happiness—though she looked mentally exhausted—
Ren's eyes flashed with a smile.
"Shizune-senpai, after what we just did, I think I might have a way to improve your figure."
As he spoke,
he pointed toward the front of her chest.
Temptingly, he asked:
"Do you want to try?"
"Improve… my figure?"
Shizune froze.
She looked at him in surprise.
Her cheeks turned slightly red, but she couldn't help feeling tempted.
She asked softly,
"What method? You're not tricking me, right?"
"Of course not. Listen carefully…"
Ren patted his chest confidently.
A faint smile appeared in his eyes as he whispered something into Shizune's ear.
"First you do this, then that, and finally…"
"And that's it."
"Really? But that sounds a bit…"
"Don't you want to be like Tsunade-nee?"
"Th-that… but…"
"Well, if you don't want to, then I'll go back first."
"Wait—! I… alright!"
"But you're not allowed to tell anyone!"
"No problem!"
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