Ninja World: I, Kisame Hoshigaki, am no longer human!

Karin rolled up her sleeves and stretched out a fair arm in front of Kimimaro's mouth, hoping to heal him with her chakra.

"It's no use, Karin. Your actions will not only fail to cure him, but may even worsen Kimimaro's condition. After all, you are both inheritors of the Sage Body, and using Yang Release on Yang Release is like adding fuel to the fire."

Kisame suddenly spoke, startling Karin, who quickly withdrew her hand.

"What exactly happened to Kimimaro?" Yekura asked curiously after hearing Kisame's words.

Kisame, not intending to play the riddle-maker, directly pointed to Karin and Kimimaro, explaining the reasons in detail:

"Among the descendants of the Sage of Six Paths and his brother are the five major clans: Uzumaki, Kaguya, Senju, Uchiha, and Hyuga. The first three clans inherited the Sage Body of the Otsutsuki clan, while the Uchiha and Hyuga inherited the Sage Eyes. To put it more simply, they inherited the power of Yang Release and Yin Release respectively."

However, while these descendants inherited the bloodline of their ancestors and reaped the benefits, they also had to bear the dangers that came with this power.

Because a person is composed of two parts, mind and body, if one part is too strong and the other part is too weak, it will cause an imbalance in the body, resulting in various symptoms.

This is the origin of hemophilia.

The three kids seemed to understand but not quite, while Ye Cang seemed to be deep in thought.

"You mean Kimimaro's Yang Release was too strong, and without the support of Yin Release chakra, his body became imbalanced, leading to various illnesses?"

After thinking for a moment, she asked Kisame.

"Yes."

Kisame nodded and continued, "As far as I know, members of the Uchiha clan who awaken the Mangekyou Sharingan also experience symptoms of bloodline disease. The more frequently they use the Mangekyou ability, the weaker their bodies become, and eventually, they will go blind. The reason for this is the same as Kimimaro's condition."

"Teacher, how can we cure Kimimaro's bloodline disease? Please save him!" Bai pleaded anxiously, her voice trembling with tears.

"In short, it's about yin and yang harmony. All you need to do is inject Yin Release chakra into Kimimaro's body to neutralize his own Yang Release chakra."

Kisame smiled slightly and gave the answer.

"But where are we going to find Yin Release chakra?" Yekura asked, frowning.

"Do you remember Obito Uchiha? He also awakened the Mangekyou Sharingan, but he could use his abilities frequently without showing any symptoms of bloodline disease. That's because he transplanted Hashirama Senju's cells, thus gaining the power of Yang Release."

Kisame didn't answer Pakura's question directly, but instead brought up Obito.

Yekura was a quick learner, and she immediately realized, "I understand. To cure Kimimaro's bloodline disease, we need an equivalent amount of Yin Release chakra, which is the eyes of the Uchiha or Hyuga clans?"

"The equivalent of Hashirama's cells is the Mangekyou Sharingan of the Uchiha clan."

Kisame smiled slightly and followed Yekura's words, taking out a test tube filled with solution.

Inside that test tube were a pair of scarlet Sharingan eyes.

These are Fugaku Uchiha's eyes. They were taken by Kisame during the Third Shinobi World War and then kept hidden away as a trump card. I never expected they would come in handy now.

You wouldn't be thinking of...

When Yekura saw Kisame take out his Sharingan, she already guessed what he was going to do.

Sure enough, Kisame walked up to Kimimaro and first instructed Bai and Karin, "You two should go to the side. The following scene may be a bit bloody, so children shouldn't watch it."

After the two were led aside by Yekura, Kisame did not hesitate to stick his fingers into Kimimaro's eyes.

"what!"

Kimimaro let out two screams in succession and fell into a coma on the spot, remaining motionless.

A moment later.

"All right."

Kisame clapped his hands and stood up. In the test tube in his hand, the Sharingan from before was gone, replaced by Kimimaro's freshly removed eyes.

The three of them turned around and saw Kimimaro with his eyes closed, surrounded by blood, looking quite terrifying.

Kimimaro, are you alright?

Haku and Karin ran to Kimimaro's side and asked with concern.

"I feel much better."

As Kimimaro spoke, he slowly opened his eyes, revealing a pair of scarlet three-tomoe gems.

Upon meeting Kimimaro's gaze, both Haku and Karin shuddered, their minds momentarily dazed. This was because Kimimaro had unconsciously activated a Sharingan genjutsu.

Kisame patted the two children on the shoulder to wake them up, then asked Kimimaro, "How does it feel to have a new pair of eyes?"

"Teacher, it's amazing! The power of Yin Release and Yang Release has merged within me, causing some incredible change. I feel stronger than ever before!"

Kimimaro replied with delight as he pondered the question.

During this process, his eyes changed again, eventually forming the shape of a kaleidoscope.

"Be careful to control your childlike power. If you use Amaterasu, it might burn your two companions to death on the spot."

Kisame offered a reminder.

Upon hearing this, Kimimaro was so frightened that he quickly looked away and closed his eyes tightly.

After he gradually adapted to his newly transplanted Sharingan and it reverted to the three-tomoe state, Kisame continued:

"The eyes I transplanted into you belong to Fugaku Uchiha, the father of Itachi and Sasuke Uchiha, and the current head of the Uchiha clan. The Yin Release energy they contain can greatly alleviate your bloodline disease symptoms. But if you want to reach the pinnacle and become a truly invincible powerhouse, you may need to find a more powerful pair of eyes yourself in the future, such as the Rinnegan of the Uchiha clan or the Tenseigan of the Hyuga clan."

"Just like Lady Tsunade, right?"

Kimimaro had also heard Kisame's earlier words, so he immediately understood what the latter meant and thought of Tsunade.

Tsunade is very similar to Kimimaro. As a member of the Senju clan, she inherited the Sage Body of the Otsutsuki clan and later obtained the Tenseigan, which is why she was able to become the strongest ninja in the world.

Kisame smiled and said no more.

The second phase of training began soon, just as Kisame had predicted.

Because he had made a pact with Tsunade that he could not use the power of the Tailed Beasts in the disciples' matches, his main goal was to help his three disciples continue to develop the power of their own bloodline limits.

"Bang! Bang!"

Kisame created two shadow clones, each carrying Haku and Karin, and they left the Kamui dimension for other places.

Then, he instructed Kimimaro:

"You've already mastered the abilities of the Corpse Bone Pulse quite well, so for the next while, you'll stay here with me to learn how to use the Cursed Seal and adapt to the Sharingan's Child Power until you've mastered both."

After arranging for Kimimaro to begin training, Kisame then said to Yekura:

"Could you please go back and report to Tsunade, revealing some information as appropriate, and also help me gather intelligence on her disciples? Is that alright?"

"Ah."

Ye Cang nodded with a slight blush, and was then sent out of the Kamui Dimension by Kisame.

One day later.

In the Land of Water, in a village that is perpetually covered in snow, two strangers arrive.

Do you remember this place?

Kisame pointed to the deserted, abandoned village in front of him and asked Haku beside him.

"This is the Snow Village, the place where my mother and I used to live."

Bai tried his best to remain calm and replied.

As soon as I returned here, memories flooded back like a tide.

At that moment, he recalled his childhood and the scene where his mother, Yuki-onna, had to kill his father and the villagers with her own hands to protect him.

This is the tragic fate of the Snow Clan.

"If one day, the fate of the Yuki clan were to befall you and your mother again, would you have the confidence and strength to protect her?" Kisame asked again.

"I will protect my mother from anyone's harm, I swear," Bai said without hesitation, his face resolute.

"Very good. Remember your determination, because you will need it to get through the next month."

Kisame got the answer he wanted, and then took Haku away from the Snow Village and continued north.

Two days later, the two arrived in the Snow Country, on a desolate wasteland covered in ice and snow.

"If you can comprehend the truth of Ice Release and become one with this boundless snow and ice, you can survive. Otherwise, you will be buried forever on this snowfield."

Kisame only said this to Shiro before disappearing in a flash.

"teacher!"

Byaku watched Kisame leave with wide eyes, and after the initial panic, he gradually calmed down.

Given the teacher's personality, he would never joke around.

So, he really might die.

So, facing the swirling snow and the endless, desolate snowfield, Shiro, while pondering Kisame's words, began his journey of survival in the wilderness.

Meanwhile, on the other side...

Kisame's other clone brought Karin to an island in the ocean, the ruins of the Land of Whirlpools.

Looking around, all that could be seen were ruins and devastation. The once bustling and prosperous Whirlpool Village had become a deserted wasteland, and the Whirlpool Clan, along with it, had been forgotten by the world.

"Karin, do you know why the Uzumaki clan was wiped out?" Kisame asked.

“My mother said that it was because everyone was afraid of our power and worried that the Uzumaki clan would use sealing techniques to control the tailed beasts and create weapons of war that they united to conquer the Land of Whirlpools.”

Karin said softly, her eyes darkening.

"So, that's why you've always been afraid to use your power?"

Kisame continued to ask. He had already noticed that Karin had been subconsciously restraining herself, as if the power of the Uzumaki clan was inherently sinful.

"Teacher, I..." Xianglin stammered, unable to speak.

"Karin, remember this: the sin of the Uzumaki clan is not because they were born strong, but because they were not strong enough. There is only one original sin in this world, and that is weakness."

Kisame stared intently at Karin and spoke with burning eyes.

Next, he took Karin to the shrine in Uzushio Village. Inside the main hall, countless skeletons were scattered everywhere, a horrifying sight that revealed how many members of the Uzushio clan had perished here.

Witnessing all of this deeply shocked young Karin.

"Karin, a powerful force lies dormant within you, but you need courage and determination to awaken it. For the next month, live in these ruins, listen to the voices of your fallen kin, and grow stronger while carrying their last wishes."

After saying these words, Kisame left Karin, who was still in a daze, and turned to leave.