As for why it was Amaterasu, Mizuki also had some guesses.

Logically speaking, for the current Uchiha Sasuke, the possibility of Amaterasu and Tsukuyomi being able to reside in his own Mangekyō Sharingan should be similar.

However, the eye technique of Kagutsuchi No Mikoto, the Mangekyō Sharingan in his right eye, happens to be an eye technique that perfectly controls fire.

Only by being able to restrain and perfectly control Amaterasu can it remain firmly in the left eye, but Tsukuyomi naturally does not have this opportunity.

Uchiha Itachi probably didn't know what kind of eye technique Uchiha Sasuke would awaken. It was just that in the attempt before his death, he happened to meet the conditions for the hosting of Amaterasu's ability.

"Specialty? That is to say, my left eye should have a pupil technique that is extremely suitable for me. What is it?"

"I don't know about that, but I felt an extremely powerful lightning force in your left eye!"

"Thunder escape?"

Uchiha Sasuke was stunned at first, then he understood.

"It should be so. Since Chidori, I have been practicing Lightning Release with all my heart. If it wasn't for the Lightning Release Eye Technique, it would be a little abnormal."

Shuimu did feel the aura of Thunder Release, and he didn't find it surprising at all.

Uchiha Sasuke's own will is very consistent with the style of a martial god who is keen on fighting. This reminds Mizuki of the name of a martial god in his previous life - Takemikaze God, a top war god who wields the power of swords and lightning and is good at archery. He was incarnated from a drop of blood of the God of Fire. This God of Fire has the same name as the unique eye technique of Uchiha Sasuke's right eye - Kagutsuchi.

This kind of eye technique that has been passed down from generation to generation is the perfect match for Uchiha Sasuke's power, but now, due to some accidents, his left eye has become Amaterasu...

"Can that unknown Lightning Escape Technique still be awakened?"

"Only God knows."

A Mangekyō Sharingan is like a guest room. There is already a tenant occupying the seat inside. Whether another person can move in is influenced by many factors.

But the room must be big enough. In other words, Uchiha Sasuke must be strong enough to make his Mangekyō Sharingan powerful enough to support the consumption of two powerful eye techniques.

The position of the left eye's pupil technique has been occupied. Whether the unique pupil technique of the left eye's Mangekyō Sharingan can be developed depends on fate.

Mizuki didn't bother to care about the hidden Easter eggs in the original plot that he didn't know about. Maybe after Kaguya Otsutsuki died, Uchiha Sasuke would not be able to find a way to awaken the true eye technique of his left eye.

Moreover, the power of Amaterasu combined with Kagutsuchi is actually quite powerful, and is not necessarily worse than the Lightning Release Eye Technique that was supposed to be awakened.

"Let's put all that aside for now. Now, are you sure you want to transplant Uchiha Itachi's Mangekyō Sharingan?"

This is exactly why Uchiha Sasuke hid from others and instead went to Mizuki first.

If I let others know that I'm in such a bad condition and my eyes are almost blind, someone might accidentally happen.

Only with sufficient strength can you have the confidence to deal with the subsequent criticisms.

"Please, Mr. Mizuki!"

Being able to say the word "please" is really rare for the proud Uchiha Sasuke. This also indirectly shows that as his strength increases and the day of revenge for his family is getting closer, Sasuke's mentality is slowly changing.

"Well, if anything unexpected happens, I can only save your life. As for whether your strength can be improved, it depends on luck."

Mizuki no longer dares to rely on his memory of the original work for the things he handled. Danzo Shimura died before the Five Kage Tournament even started. What else is impossible to happen?

…

This was the first time Shuimu had done such an eye power transplant, so he was very cautious. The power brought by this thing would be the reliance for saving the world in the future, and it would be terrible if it was destroyed in his own hands.

Fortunately, there were no accidents until the end. Looking at Uchiha Sasuke with his eyes blindfolded, Mizuki breathed a sigh of relief:

"The operation was successful and the wound has healed, but it's impossible to adapt so quickly. After a period of time, gradually expose yourself to the light outside. Once the pupil power is completely integrated, there will be no problem."

"Then I'll be bothering Mr. Mizuki during this time."

“You’re welcome!”

Mizuki also gained a lot. Just the cell sample from Uchiha Itachi's body that was taken away by Sasuke made Mizuki very satisfied. It was enough for him to perform the Impure World Reincarnation several times.

What surprised Mizuki the most was that he found Uchiha Shisui's Mangekyō Sharingan on Uchiha Itachi. If he added Uchiha Shisui's right eye that he had obtained from Shimura Danzo's body, a complete pair of Mangekyō Sharingan was easily delivered to Mizuki.

"After searching everywhere for something, I finally found it without any effort! Does that mean my luck is about to turn around?"

Of course, fate would not favor Shuimu, an outsider, but the butterfly effect caused by Shuimu was so big that it was difficult to control all the details.

In the original work, the Mangekyō Sharingan of Uchiha Shisui owned by Danzo Shimura was eventually obtained by Uchiha Obito. Kabuto Yakushi asked to use it as material for the Impure World Reincarnation of Uchiha Shisui but was rejected. In the end, this Mangekyō Sharingan was useless and disappeared inexplicably.

The Mangekyō Sharingan in his left eye was placed by Itachi Uchiha on the summoning beast, the crow, and hidden in Uzumaki Naruto's body with a transcription seal as a backup plan to protect Sasuke Uchiha from betraying the Konoha Village. However, it eventually became the opportunity for Itachi Uchiha to escape the Impure World Reincarnation.

But now, Uchiha Sasuke did not defect at all, and Uchiha Itachi died without having the chance to arrange this precious Mangekyō Sharingan.

"This is your chance to use Kotoamatsukami. You should think carefully about it!"

First of all, of course, you need to figure out how to use it.

How can non-Uchiha people use the Mangekyō Sharingan's eye techniques safely and without any consequences?

Also, a pair of Mangekyō Sharingan, it seems that he can use Susanoo.

"I'm really looking forward to it!"

Combat effectiveness is secondary. The key is that this kind of research material is hard to come by and is really rare.

As a product of the embodiment of spiritual power, the Butterfly of Reincarnation, the incarnation of Shuimu's obsession created by Xishuixiang, seems to have hit a bottleneck recently.

With the help of the chakra of the nine tailed beasts and the power of faith of the common people of the Rain Land, there was no visible progress for the time being.

The potential of the Eight-Headed Technique is almost exhausted. If you want to go further, you need more information. Kotoamatsukami and Susanoo are the best references.

After planning for so long with trepidation, the time has finally come to reap the rewards. Some things that were originally just ideas are now slowly becoming reality.