After dinner.
It wasn't only Shizune who followed Ren back to his room.
Tsunade and Karin, both full of curiosity, came along as well.
Looking at Shizune sitting cross-legged on the floor, slightly nervous, Ren smiled and said,
"Senior Sister, you don't need to be nervous. I've already possessed other ninjas before to test it. Theoretically, there shouldn't be any problems."
The current Shizune was far more outstanding than she had been in the original trajectory.
Over the past two years, with relentless effort, her chakra control had improved significantly.
Although it still hadn't reached the level required to properly cultivate the Yin Seal (a technique that stores large amounts of chakra in a seal on the forehead), she had at least managed to barely master the Monster Strength Fist (super-strength taijutsu taught by Tsunade).
"Wait, Ren…"
Shizune raised her hand and voiced her objection with some helplessness.
"Even if you help me condense the Yin Seal, my personal chakra control is limited. I still wouldn't be able to directly master it."
"If it were someone else, this approach wouldn't have much meaning. Once your spirit leaves, they might not even be able to mobilize the chakra stored in the seal."
"That's true for most people."
Ren nodded and explained with a smile.
"But Shizune-senpai is different. Your chakra control has improved a lot over these two years, and your medical ninjutsu is already quite advanced."
"If you can personally experience the cultivation process of the Yin Seal and the Strength of a Hundred Technique (Byakugō no Jutsu — a technique that releases the chakra accumulated in the Yin Seal) from nothing to completion, then after repeating it many times…"
"Your body will gradually form a kind of muscular memory."
Beside them, Tsunade stroked her chin and nodded approvingly.
"With that kind of foundation, as long as you continue working hard afterward, it's not impossible for you to eventually master those two techniques."
She had seen Shizune's dedication with her own eyes.
But unfortunately, words like "talent," "aptitude," and "natural ability"—
simple as they sounded—
could leave many people in despair.
Hard work alone wasn't always enough to overcome them.
Sometimes opportunity and luck were also required.
And clearly, Ren was someone who could bring those factors to Shizune.
Maybe it really could succeed.
"If one attempt doesn't work, then we'll try twice…"
Ren said with a smile.
"Or ten times. A hundred times. After half a year or a year, I believe you'll be able to do it."
During the past two years, this senior sister had silently supported him behind the scenes.
She had done everything she could to help him, never complaining, and never expecting any reward.
Naturally, he didn't mind returning the favor.
If it were anyone else, he definitely wouldn't have had this kind of patience.
"Ren…"
Hearing those words, Shizune stared blankly at her junior disciple.
A warm current surged through her heart, and she felt deeply moved.
"Thank you!"
"Do we really need to say that between siblings?"
Ren smiled.
"These past two years, you've helped me a lot too, Senior Sister."
"Mm…"
Shizune's eyes glistened.
She nodded vigorously with a smile.
The Yin Seal and the Strength of a Hundred Technique complemented each other.
For someone like her—who had inherited Tsunade's medical tradition and already possessed considerable medical skill—mastering these two techniques was practically a ticket to eternal youth.
Even someone as reserved and conservative as Shizune, who usually didn't bother dressing up much, couldn't help feeling excited.
After all—
what woman wouldn't want to remain youthful forever like Tsunade?
"Good luck, Shizune-senpai!"
Karin clenched her fists and encouraged her sincerely.
Over the past two years, Shizune had treated her like a real older sister.
She always quietly gave her support and took meticulous care of her younger sister.
Even Tsunade and Ren weren't nearly as attentive and considerate.
Aside from her mother Uzumaki Nanako, Shizune was the person who cared about her the most.
Of course Karin noticed that.
She had long regarded Shizune as her true elder sister.
Naturally, she hoped Shizune would succeed in mastering the Yin Seal and the Strength of a Hundred Technique.
"Tsunade-nee, Karin… you two should go out first."
Ren smiled and said,
"As long as I'm here, there won't be any problems."
"Alright, then be careful."
Tsunade nodded.
She naturally knew that cultivating forbidden techniques like the Yin Seal and the Strength of a Hundred Technique required absolute quiet.
Moreover, she had complete confidence in Ren's strength.
Even if it failed, nothing serious should happen.
So she took Karin and left the room.
"Then I'll begin."
Ren didn't say anything else.
He sat down cross-legged and calmly formed hand seals.
A semi-transparent spiritual body instantly separated from his physical form and entered Shizune's body.
"Eh? Ren?"
Shizune felt her consciousness blur.
In the blink of an eye, she had arrived inside her own spiritual world.
Looking at Ren appearing before her, she said in astonishment,
"So this is Uncle's Spirit Transformation Technique? It's incredible…"
"To be precise, it was the Spirit Transformation Technique your uncle mastered."
Ren smiled.
"He didn't invent it."
"It was actually created by the Second Hokage."
"I see…"
Shizune nodded.
Then she looked at him and asked,
"So what should I do now?"
"You only need to calm your mind, relax, and relinquish control of your body. Don't resist at all."
Ren said calmly.
"Focus completely on sensing the flow of your chakra and every subtle change in your body. Don't miss even the smallest detail."
"Leave the rest to me. I'll take full control of your body."
"Okay…"
With Shizune's active cooperation, Ren easily took control of her body.
Unlike the previous time when he controlled that ninja from the Hidden Hot Water Village, he didn't have to suppress her consciousness with overwhelming spiritual force.
The next moment—
"Shizune" opened her eyes.
"She" stretched lazily and stood up, moving around.
Swinging her arms.
Kicking her legs.
Bending her waist.
Quickly adapting to this somewhat unfamiliar body.
"Eh? Ren, this…"
Inside the spiritual world, Shizune's pretty face flushed slightly red.
Because Ren had casually done a full front split using her body.
The sensation was very strange.
Every movement Ren made, she could feel clearly.
It was as if she herself were moving.
But at the same time—
it felt like she had no secrets that could be hidden from him.
That made her feel a little shy.
"Ahem… I was just checking your body's flexibility, Senior Sister. That's very important…"
Ren coughed lightly.
A blue sphere of chakra appeared in his palm.
Mobilizing the chakra inside her body, he effortlessly formed a Rasengan (a compressed rotating sphere of chakra).
Feeling how well he could control this body, he said,
"Alright. Let's begin."
He had to admit—
this senior sister's body was really flexible.
Practically born for… certain stances.
It was just that her usual clothing and style were far too low-key and conservative.
She insisted on turning herself—from the dignified eldest disciple of one of the Legendary Sannin—into an inconspicuous little attendant.
Otherwise, her appearance would easily gain another ten or twenty points.
It seemed that in the future, he would have to properly guide this senior sister a little.
As for her physique…
While he had this opportunity, he might be able to make some subtle adjustments using his precise chakra control.
Like water dripping through stone.
Over time—
it could gradually improve further.
A completely natural method.
No additives required.
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