I will use the ninja world to aid my cultivation of immortality.

Especially the iconic tomoe, which can be easily recognized by anyone who knows the Sharingan.

"In reply to you, sir, I was fortunate enough to learn from the clan's historical records that the Uchiha clan's Sharingan, in addition to the tomoe form, also has a more advanced evolved form called the Mangekyou Sharingan!"

Seeing Naraku looking at her, Hinata Rinka quickly bowed and replied.

Beside her, Hyuga Yuika glanced at the Sharingan in Naraku's hand, then at her sister, her eyes revealing a complex expression.

Naraku wasn't too surprised by Hinata Rinka's answer.

The Hyuga and Uchiha clans share a long history, and because they both inherit the same dojutsu (eye technique) and bloodline limit, the two clans were often in competition even before Konoha was established.

Therefore, it is quite normal for the Hyuga clan to have records of the Mangekyou Sharingan.

Of course, this is why Hyuga Rinka has a special status within the Hyuga clan.

After all, in addition to being a member of the Hyuga main family, she had been betrothed to Hyuga Hiashi since childhood.

As the fiancée of the young clan leader, Hyuga Rinka naturally wields considerable authority within the Hyuga clan.

In contrast, there's her younger sister, Hinata Yuika.

The reason she looked at her sister with such a complicated expression was because she knew nothing about the Mangekyou Sharingan.

They are biological sisters, born to the same parents, but because one was born a few seconds later, they received completely different treatment within the clan.

“My lord, my sister was far too reckless just now. You should really punish her properly.” Hinata Yuika suddenly interjected, stepping forward to massage Naraku’s shoulders.

"Oh? Then tell me how to punish your sister?" Naraku asked, his expression unchanged, as he felt the kneading on his shoulders.

Hinata Yuika glanced deeply at her sister, who was staring at her in astonishment, and said softly, "I'll punish you by making you support my back for the next week when I serve you, sir."

"Hold my back? Oh, you mean that? Sounds good, let's do it that way!"

Naraku had initially thought that Hinata Yuika would propose some excessive punishment, but to his surprise, she only offered a lenient sentence. He couldn't help but smile knowingly and agreed to her suggestion.

Having spent some time with the twin sisters Hinata Rinka and Hinata Yuika, he naturally understood the relationship between the two sisters.

Don’t worry about scarcity but inequality.

Because of their vastly different lives, and the oppression they faced from the main family after becoming a member of the branch family, younger sister Hinata Yuika harbors a deep jealousy towards her older sister Hinata Rinka.

If her life hadn't changed, Hyuga Yuika would undoubtedly have ended up like Hyuga Hizashi, numbly and powerlessly accepting her fate.

But now, her life has changed.

Although she is still under the control of the "Caged Bird," her sister is no longer the high and mighty head of the family.

This gradually changed Hinata Yuika's mindset, and she began to openly and secretly challenge her older sister.

Some were focused on cultivation, while others were vying for Naraku's favor.

Naraku had actually seen through Hinata Yuika's actions.

He could actually understand that perfectly.

Given the other's life experiences and the oppression the Hyuga clan exerted on the branch family, Hyuga Yuika's petty jealousy was already a manifestation of their deep sisterly affection.

If it were anyone else, they might have already become enemies.

Therefore, as long as it's kept within the red line, Naraku doesn't mind Hyuga Yuika's slight jealousy.

After all, he was the beneficiary in matters like vying for favor.

Hinata Rinka blushed at the punishment proposed by Hinata Yuika, but with Naraku's permission, she obediently accepted it.

After teasing the two sisters for a bit, Naraku turned around and began to examine the newly evolved Mangekyou Sharingan in his hand once more.

"After being nurtured for so long, it has finally evolved again!"

Looking at the Mangekyou Sharingan in his hand, Naraku's eyes revealed a smile.

Chapter 191 Integration Research

This Mangekyou Sharingan is the evolved form of one of his three-tomoe Sharingan, which he has been nurturing with his true energy.

Because this is the second Mangekyou Sharingan, he named Uchiha Kagami's one "Mangekyou Sharingan No. 1" to distinguish it, and this one is "Mangekyou Sharingan No. 2".

In his research, Naraku discovered that the Mangekyou Sharingan No. 2 did not exhibit any abnormalities due to its different evolutionary path.

Besides the significant improvement in basic eye power compared to the [Three-Tomoe Sharingan], the development of eye techniques is also quite normal.

The Mangekyou Sharingan No. 2 differs from the Mangekyou Sharingan No. 1 in that the eye technique it develops is not the extremely rare dual eye technique like "Kamui" and "Great Property," but rather a common dual eye technique.

The second Mangekyou Sharingan gave birth to the eye techniques "Tsukuyomi" and "Kagoto-no-Mikoto".

The Sharingan is the eye that reflects the soul.

The eye techniques that develop from the normal evolution into the Kaleidoscope are often influenced by the thoughts and ideas conceived during the evolution process.

Just like Sasuke Uchiha, who craved power, he developed two eye techniques, "Amaterasu" and "Kagoto-no-Mikoto," which were excellent for combat.

Obito Uchiha, on the other hand, wanted to escape reality, and what he created was "Kamui," a path to another world.

Naraku's situation is rather special.

First, he was not a member of the Uchiha clan; second, the Sharingan was refined into a magical artifact; and third, the evolution of the Mangekyou Sharingan was not due to emotional stimulation, but rather nurtured by true energy.

This makes the resulting pupil technique less influenced by his thoughts and more random.

Of course, no matter what, as long as the eye technique is fine, that's enough for Naraku.

"Tsukuyomi and Kagutsuchi?"

The two eye techniques born from the [Second Mangekyou Sharingan] are relatively familiar because they both appeared in the original story.

"Tsukuyomi" is a type of illusion-based eye technique.

This eye technique can pull the enemy's mind into an illusionary space where all factors, including time, place, and quality, are controlled by the caster, as long as there is eye contact.

Most importantly, no matter how long you stay in the illusion space, it's only a moment in the outside world.

This eye technique is quite practical, whether used in combat or for interrogation.

Then there's "Kagutsuchi".

In the original storyline, Sasuke Uchiha, who developed this eye technique, used it in conjunction with another eye technique, Amaterasu.

However, based on the eye technique information that Naraku has obtained at this moment...

"Kagoto-no-Mikoto" is not only used in conjunction with "Amaterasu"; its essence is simply a manipulative eye technique.

It can control Amaterasu fire, as well as energy including chakra.

For example, if one can control chakra through the "Kagoto-no-Mikoto" technique, one's control over chakra will be greatly enhanced.

"This Mangekyou Sharingan would actually suit Nonou quite well!"

Having learned about the eye techniques of the [Second Mangekyou Sharingan], Naraku pondered for a moment.

The essence of "Super Strength Technique" lies in the control of chakra.

If Nonou could receive the blessing of "Kagoto-no-Mikoto", even without considering the basic eye power of "Tsukuyomi" and Mangekyou Sharingan, it would be enough to greatly enhance her "Super Strength Technique".

Of course, Naraku still needs to conduct more detailed tests before handing over the [Second Mangekyou Sharingan] to Nonou.

For example, he wanted to confirm whether two kaleidoscopes that were not related by blood could really not merge into the Eternal Kaleidoscope.

He also wanted to see if there were any other differences between the two kaleidoscopes besides their eye techniques, and whether he could research more information about the kaleidoscopes.

"So it really won't work?"

On the ninth floor of the Star Tower, Naraku removed the True Fire Cauldron in front of him and took the two Mangekyou Sharingan that flew out into his hands.

Looking at the two Mangekyou Sharingan in his hand, Naraku's face showed regret.

Just now, he attempted to fuse the two Mangekyou Sharingan using weapon-refining techniques.

However, while fusion is possible, the method and effect of fusion are not what he wanted.

Naraku's desired fusion effect was naturally to fuse the two Mangekyou Sharingan into a higher-level Eternal Mangekyou Sharingan.

However, during the fusion, he clearly felt a certain degree of repulsion between the two Mangekyou Sharingan.

If he were to force the fusion, while it wouldn't destroy both Mangekyou Sharingan, he would at most gain a Mangekyou Sharingan with slightly enhanced eye power.

If the fusion effect of the Eternal Mangekyou Sharingan is 1+1>2.

So the current fusion effect is 1+1=1.2 or 1.3.

With this kind of fusion effect, it would be better to keep both Mangekyou Sharingan.

If it cannot be fused into the Eternal Mangekyou Sharingan, then for Naraku, it is a fusion failure.

Thinking about his research on the two Mangekyou Sharingan these past few days, Naraku fell into deep thought.

Although they belong to the same clan, the Sharingan awakened by different people is obviously different, just like blood type.

To fuse them into the Eternal Mangekyou Sharingan, they must be Mangekyou Sharingan with the same blood type.

"However, if we fuse them using the method of refining magical artifacts, there is still hope that so many Mangekyou Sharingan can be fused into the Eternal Mangekyou Sharingan!" Naraku pondered.

Quantitative change leads to qualitative change.

Leaving aside Hagoromo Otsutsuki, even Indra, upon awakening his Mangekyou Sharingan, directly possessed the characteristics of the Eternal Mangekyou Sharingan.

The Uchiha clan, descended from Indra.