Upon hearing Uchiha Kaito's words, Shisui felt like a drowning man grasping at a final straw. It could be said that Uchiha Shisui was the one who most hoped for peaceful coexistence between his clan and the village.
If my proposal were for the Uchiha clan to leave Konoha, Uchiha Shisui would likely be the most distressed, or rather, the most opposed, even though the best solution right now would be for the Uchiha clan to leave Konoha.
Because Konoha Village, as the first ninja village, has too many large and small incidents. Not to mention anything else, in a few years, Jiraiya's rogue disciple will come to Konoha to capture the Nine-Tails, starting with an almighty push that will flatten the vast Konoha Village. And so on and so forth... So, the best solution now is for the entire clan to relocate and leave Konoha Village. Perhaps the Third Hokage, seeing the Uchiha clan being so sensible, might even hold a farewell ceremony. However, after the farewell, they might directly proceed to legitimately wipe out the Uchiha clan.
Moreover, for Uchiha Shisui, who believed in the Will of Fire, he loved not only his clansmen but also the entire Konoha Village. Therefore, Uchiha Shisui would likely not agree with this idea.
So, as a second-best option, to preserve his own life and the lives of the Uchiha clan, only by easing the tension between the clan and the village could the Uchiha clan's fate of being annihilated be changed.
Thinking of this, Uchiha Kaito posed his question to Uchiha Shisui.
"Shisui, on whom do you intend to use this genjutsu? Tell me, and I'll see if it's correct."
Uchiha Shisui scratched his head, a little embarrassed.
"I want to use Kotoamatsukami on Danzo Shimura and our clan leader. That way, we can ease relations and reduce conflicts."
Uchiha Kaito listened to Shisui's words and covered his head in despair.
"Don't you know where the problem lies? Danzo is merely the Uchiha's overt enemy. The one truly uneasy about the Uchiha and capable of making decisions is the Third Hokage. Furthermore, within our clan, our clan leader is not a warmonger; he has always been trying to mediate relations between the clan and the village, though his efforts haven't been very effective. The ones truly stirring up conflict are the Great Elders. Shisui, you're targeting the wrong people."
It was unexpected that Uchiha Shisui's combat talent was so high, yet he was completely inept at seeing the essence of things.
Uchiha Shisui, upon hearing Kaito's words, realized how naive he had been and asked with some uncertainty:
"So, my target for the genjutsu should be the Third Hokage and the Great Elders?"
Kaito shook his head: "Not enough. Danzo and the Third Hokage have too close a relationship. If you change the Third Hokage's thoughts, it won't be long before Danzo notices something is amiss. By then, we'll have no way back. Either you, Uchiha Shisui, betray us, or the Uchiha clan will be annihilated. So, you must at least change the thoughts of three people simultaneously for this matter to succeed."
Hearing Uchiha Kaito's words, Shisui angrily and dejectedly threw the stone in his hand into the river.
"Is there no other way?"
Seeing Uchiha Shisui sulking, Uchiha Kaito hesitated, opened his mouth as if to speak, but then closed it without saying anything.
Seeing Kaito's expression, a glimmer of hope rekindled in Shisui's heart.
"Do you have an idea? Given the current situation, what can't be said?"
Looking at Shisui's eager eyes, Uchiha Kaito thought for a moment and then spoke.
"Actually, my Sharingan ability, 'Copying Eye,' has another power: it can copy the dōjutsu of the Mangekyo Sharingan. I didn't mention it before because I didn't intend to use this ability, to avoid you misunderstanding and thinking I was trying to pry into your dōjutsu."
Although he felt a little guilty for deceiving an honest person, Uchiha Kaito had no choice. At present, Uchiha Shisui's Mangekyo dōjutsu was the easiest to copy. Only in this way could his Sharingan evolve at the fastest speed.
Moreover, he also intended to help Shisui. If his Sharingan didn't awaken the Mangekyo, he would at most be a high-level cannon fodder, let alone save Uchiha Shisui's life and change the Uchiha clan's fate of being annihilated.
Uchiha Shisui hadn't expected Uchiha Kaito's Sharingan to also be able to copy his dōjutsu. He was surprised at first, but that was quickly replaced by joy.
"How could I? I'm thrilled! I'm very willing to contribute to the survival of the Uchiha clan."
Although Uchiha Shisui loved the village very much, he loved his clansmen even more. Even until his death, he was thinking of both his clansmen and the village.
The Uchiha clan's bloodline was very strange; those who sought power were often not very strong, while those who didn't want power and only wanted love, paradoxically, gained power that others could only dream of after losing their love.
That's why the Second Hokage considered the Uchiha clan an evil clan, because the Uchiha's strong members (those who awakened the Mangekyo Sharingan) had basically all lost someone they loved, meaning they had all been 'darkened.'
Uchiha Kaito saw Shisui agree to his request so readily and couldn't help but ask Shisui:
"Shisui, don't you suspect that I'm lying to you?"
"How could I? I trust you! You are my best friend, someone I can entrust my life to!" Uchiha Shisui said with a bright smile upon hearing Kaito's words.
Hearing Shisui's words, Uchiha Kaito was deeply moved and secretly swore:
Don't worry, Shisui, you are my best friend too. I will definitely save your life and save our clan.
"Then, Shisui, let's begin. Now, you need to activate your Mangekyo Sharingan. That way, I can copy your dōjutsu. Don't worry, it will be quick, and it won't cause you any harm."
Hearing Uchiha Kaito's words, Shisui nodded and silently channeled the chakra within his body, sending it to his eyes.
He watched Shisui's Sharingan rotate from three tomoe, spinning faster and faster, finally outlining the shape of a four-pointed shuriken.
He had only seen the Mangekyo Sharingan in anime before; this was the first time he saw it in reality, and it felt more mysterious and magnificent than in anime, possessing a captivating power.
Seeing Uchiha Shisui activate his Mangekyo Sharingan and wait for him, Kaito immediately activated his own Sharingan and met Shisui's Mangekyo.
When Uchiha Kaito's Sharingan met Shisui's Mangekyo, he felt his own Sharingan spin faster and faster, and his chakra and mental energy were rapidly being consumed. At the same time, his Sharingan also grew hotter and hotter with the rotation of the tomoe, as if it were about to melt.
Finally, after Uchiha Kaito had consumed a large amount of chakra and mental energy and was on the verge of collapsing, the rotation speed of his Sharingan finally slowed down. The tomoe slowly outlined a pattern identical to Uchiha Shisui's Mangekyo Sharingan.
Uchiha Kaito's Mangekyo Sharingan was finally—complete.