[Orochimaru's Laboratory]
Rengoku's original body followed behind Orochimaru all the way down to the lowest level.
Besides the two of them, there were two other people here, Nawaki and Tsunade.
It turned out that Nawaki had been brought back together with Gaara and the others by Minato.
From the current situation, the experiment Orochimaru was conducting seemed to be closely related to these two descendants who carried Hashirama's bloodline.
Rengoku looked Nawaki up and down with interest and couldn't help but sigh.
"You've grown this tall already, Nawaki."
Indeed, compared to the past, Nawaki's appearance had changed quite a bit. He had already grown into a handsome and upright young man.
Although his facial features had shifted somewhat from before, that bright, sunny smile full of energy had never changed.
Toward Rengoku, the one who had saved him from death, Nawaki always carried deep respect and gratitude in his heart.
He bowed respectfully to Rengoku and spoke softly, "Lord Rengoku."
Since Rengoku wasn't currently serving as Hokage, Nawaki didn't address him with that title.
At this moment, Orochimaru walked over to a massive and complex-looking machine.
On that machine sat a platform made of sturdy metal.
And on top of that platform lay two syringes, their color deep and rich, like dark green gemstones.
Seeing this, Rengoku couldn't help but show a hint of curiosity and asked, "What is this?"
Orochimaru narrowed his eyes slightly, a mysterious smile curling at the corner of his lips as he slowly explained, "This is the product I extracted from Hashirama cells."
Hearing this, Rengoku's expression turned focused as he followed up, "So you're saying you've already managed to successfully separate Yang Release chakra?"
It should be known that under normal circumstances, almost everyone contains a certain amount of Yang Release chakra within their body.
However, those who possess Yang Release chakra with purity comparable to Hashirama's are extremely rare.
Only the most outstanding members of the Uzumaki clan can match that level of purity.
As everyone knows, when members of the Uchiha clan are injected with Hashirama cells, it can indeed repair and regenerate their damaged Mangekyo Sharingan.
But the real key factor lies in the extremely pure and immensely powerful Yang Release chakra within those cells.
Unfortunately, the cellular will contained within Hashirama's cells is far too strong, to the point that most people who attempt to fuse with it cannot withstand the impact of that power.
They very easily turn into a tree.
Danzo's modified arm was a product of settling for the next best thing.
Orochimaru shook his head, "At the moment, I still haven't been able to completely separate the cellular will within it."
"Although I've done my best to suppress it, there's still a great risk if it's used by outsiders."
Rengoku, who had been listening intently, sharply caught the key words "outsiders" in Orochimaru's explanation.
He asked, "Then does that mean if Tsunade and Nawaki use it, there won't be a problem?"
Hearing this, Orochimaru stuck out his tongue and licked his face, an excited look on his expression.
"In theory, that should be the case."
"Yesterday, I conducted a series of tests specifically for this situation, though all of them were carried out in a non-human environment."
"From my research, I found that the 'Hashirama No.1' reagent does not produce any rejection when combined with Tsunade and Nawaki's blood."
"Not only that, it also has a very high level of compatibility with Nagato's blood. Following that are Kushina, Karin, and Kasui."
When Rengoku heard the names that came after, he wasn't particularly surprised.
After all, it was well known that the Uzumaki clan and the Senju clan were distant relatives to begin with.
It was only natural that their bloodlines would have some overlap.
Orochimaru pointed at Tsunade and Nawaki standing nearby and said to Rengoku, "The reason I called you here today is to carry out human trials."
There's a big difference between non-human environments and the human body. No one knows whether something might go wrong.
As a scientific researcher, one naturally has to consider all possible unexpected situations.
For him, whether it was his old friend Tsunade or his long-lost-and-now-returned disciple Nawaki, he wouldn't allow any accidents to happen.
That was why Rengoku, who possessed the ability to revive others, was especially crucial.
Rengoku understood that this kind of matter couldn't be handled carelessly.
"I understand. That's no problem. I'll have a clone bring Karin over."
———
On the bustling streets of Konoha, Rengoku's clone slowly walked along with Karin.
They eventually stopped in front of the shop where he had once bought clothes for her.
Looking at the familiar signboard in front of him, Rengoku couldn't help but feel a wave of emotion.
"I really didn't expect this shop to still be open."
That was indeed the case. In the world Rengoku originally came from, for a shop to stay in business for five years was already no easy feat.
But thinking about it again, this was Konoha Village.
Located in a prime area with barely any competition, it made sense that it could operate successfully for five years.
Just then, a crisp chewing sound reached his ears. It turned out Karin was happily eating the fried rice cake in her hand.
After chewing hard a few times, she tried to swallow the delicious bite in one go.
But just as she was about to say something, she suddenly choked and couldn't help coughing.
Seeing this, Rengoku quickly reached out and gently patted her back, scolding her lightly, "Look at you, why are you still like a little kid?"
Hearing her master's words, Karin finally managed to catch her breath.
Then she showed a playful and adorable smile and replied, "Aren't I just Shishou's disciple?"
Rengoku smiled as he picked up a tissue and gently wiped the stain from the corner of her mouth, his eyes full of affection and warmth as he softly asked, "So are you a disciple, or a bride?"
Karin tilted her head playfully and blinked.
"Can't I be both?"
Rengoku couldn't help but laugh at her expression. He reached out and gently patted her hair.
"Alright! Alright! Then both it is."
"What were you about to say just now?"
Karin let out a clear, pleasant laugh. Rengoku's answer made her very happy.
Then she pointed at the signboard.
"So master still remembers this place."
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