'One Ka?'
Kakashi listened and felt something was off.
'Is this praising my greatness, or mocking how little chakra I have, so little that it can only be used as a standard unit of measurement?'
Kakashi immediately shook his head, "No, thanks. Why don't you try it instead? Pour in all your chakra, and when the time comes, we can call it one Obito or one Obi."
At this moment, Kakashi had completely exhausted his chakra and stopped the infusion.
The surroundings were still functioning normally.
Obito grinned, "Kakashi, just rest easy. Do you see that blue energy bar on the control panel? That represents your total chakra. As long as it's not completely depleted, there won't be any problems here."
Kakashi snorted and ignored Obito. He sat down on the ground, closed his eyes, and focused on refining his chakra.
Obito, meanwhile, looked at Rin, took out a small sealing scroll, unsealed it, and pulled out a small bottle, "Rin, this bottle contains Hashirama's cell tissue. I've already processed it based on Orochimaru's experimental data, adjusting it to the optimal state for transplantation."
"Now, I need you to transplant it onto my right arm. There are various risks associated with the procedure, but since it's just a small piece, it shouldn't be too problematic."
Rin took the bottle and hesitated as she looked at the small piece of tissue floating in a special medicinal liquid, "Obito, are you really ready for this?"
Obito nodded, sat in a chair, removed his upper garment, and exposed his entire right arm, "Go ahead. I don't think I'll fail."
Rin could only nod. She took out the surgical tools that had been soaking in disinfectant, which Obito had prepared in advance.
Then, carefully opening the bottle containing Hashirama's cells, she put on gloves and used tweezers to pick up the piece of tissue, "Obito, this might hurt a little. Bear with it."
As she spoke, a blue glow appeared on Rin's other hand. She gently touched Obito's right arm and made a downward motion.
Instantly, a wound was sliced open on Obito's right arm. Rin swiftly placed the Hashirama cells inside the wound and immediately activated the cell fusion technique.
The entire process was smooth, like flowing water. Not a single drop of Obito's blood spilled; Rin's precise technique had sealed the wound before that could happen.
Obito thought to himself, 'Rin's medical skills have improved again.'
At that moment, he felt a familiar energy surge through his right arm. It was an immense life force, also known as the power of Yang Release.
In his past life, Obito had relied on this to use his Mangekyō without concern.
However, the energy's invasive nature was extremely strong. As soon as it fused with his cells, it started spreading rapidly, showing a tendency to assimilate all the cells in his body.
Obito knew the consequences. If he failed to suppress this assimilation, his entire body would eventually turn into a tree.
But he was prepared. He activated his Three Tomoe Sharingan, and a dark, chilling chakra unique to the Sharingan emerged, confronting the invading energy.
Soon, the two forces clashed and reached a stalemate.
Thanks to his past-life experience with Wood Release, Obito seized the opportunity to manipulate this energy. Before long, he had gained full control over it.
He guided the energy throughout his limbs. His entire body became enveloped in a thick life force.
Obito smiled at Rin, "Rin, the transplantation was very successful. Maybe it's because I'm so familiar with Hashirama's chakra that the fusion wasn't too difficult. The Three Tomoe Sharingan alone was enough to suppress it."
Rin breathed a sigh of relief, "So, Obito, do you want to transplant more?"
Obito shook his head, "No need. This is enough. Hashirama's cells aren't just a mixture of Yang Release and Asura's chakra, they also integrate with my Sharingan's Yin Release chakra. Over time, they'll gradually merge with my body, reproduce on their own, and eventually replace all my original cells."
"Of course, only someone with Uchiha blood can achieve this. So, even though I transplanted just a small piece, it's already enough."
Rin was delighted, "So that means the side effects of your Mangekyō Sharingan have been resolved?"
Obito thought for a moment, then activated his Mangekyō to test it.
After a while, he said, "Partially resolved. Now, opening these eyes no longer puts a big strain on my body. Techniques that don't consume much pupil power, like using my right eye's Kamui to absorb others or teleport myself, still have side effects, but they're much less concerning now."
"It might take tens of thousands of uses before blindness even becomes an issue."
"But for the left eye's Kamui techniques, like spatial cutting and warping, as well as the more advanced abilities when both eyes are used together, there are still significant side effects. I can't use them recklessly."
Rin looked worried again, "I see… so we still need to find more solutions in the future?"
Obito shook his head, "Like I said, my original cells will gradually be replaced by Yang Release cells. This process takes time. As more of my cells are converted, my Yang Release chakra will increase, and the side effects of those abilities will naturally decrease."
Rin brightened up, "That's great! I thought transplanting Hashirama's cells would be extremely difficult, but the process turned out to be so simple."
Obito chuckled, "The hard part was in the preparation and trial-and-error. The piece of Hashirama cells you just transplanted into me was the purest fragment I managed to isolate after countless failures. And that's not even counting all the people who died in Orochimaru's experiments."
Rin thought about it and suddenly felt a sense of cruelty. Indeed, what now seemed like a simple experiment was built upon the deaths of so many, and Obito's own repeated failures.
She sighed, "As expected, intelligence and experience are the two most powerful abilities in the ninja world."
Obito nodded, and the image of Itachi surfaced in his mind. He muttered, "And also… a healthy body."
Rin immediately laughed, "Yes, health! We all need to stay healthy."
By this time, Kakashi had almost fully recovered. He stood up and said, "That's it?"
Obito nodded, "Although the side effects aren't completely eliminated, my strength has increased a lot. Today is a day worth celebrating. Let's go find Minato-sensei and have a gathering."
Kakashi scoffed but didn't object to Obito's suggestion.
With that, the group was transported out of the Kamui dimension and headed towards Minato's house.
As soon as they arrived, they heard Kushina's furious voice coming from inside, followed by the sound of her beating Minato.
Kushina was yelling, "Why didn't you tell me… Why didn't you tell me… Minato, how could you do this?"
Minato's voice came next, "Kushina, you need to calm down. The situation was urgent at the time, and there wasn't enough time. Besides—"
Kushina interrupted, "Besides what? I'm so mad!"
Everyone outside broke into a cold sweat, unsure of what had happened inside.
Since both people inside had exceptional sensory abilities, they noticed the presence at the door. Kushina paused her outburst, walked over, and opened the door.
Just as Kakashi was about to ask what was going on, Kushina sneered, raised her fist, and said, "Heh, perfect timing. You all, get inside!"
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