In the original story, when Obito released the Nine-Tails, he controlled it without even using his Mangekyo Sharingan.
This shows that even in the three-tomoe state, a Mangekyo Sharingan has enough power to control a Tailed Beast.
With this level of dojutsu, it's enough to deal with the Nine-Tails trapped inside Kushina Uzumaki's body.
Of course, this is not absolute. According to Uchiha Kai's previous life, based on the humorous analysis of netizens, a normal Mangekyō Sharingan can't control the Nine-Tails.
Obito can control it because he received a legacy from Uchiha Madara, and with the large amount of White Zetsu cells in his body, his Mangekyō Sharingan is infinitely close to the power of the Eternal Mangekyō, allowing him to control the Nine-Tails.
After all, they both have Kamui Mangekyō Sharingan.
Kakashi's, however, is ineffective against the Nine-Tails inside Naruto's body. It can't even be used to suppress the Nine-Tails, and they still rely on Yamato's Wood Release for that.
But even if this dojutsu can't directly control the Nine-Tails, Uchiha Kai is still confident. After all, he now holds so many trump cards.
With various tools at his disposal, using them to target the Nine-Tails and give it a small abstract shock should be enough.
Once the Nine-Tails feels the "pressure" of a sack of rice on several floors, it will naturally calm down and sit down to communicate with them.
Just like when it was controlled by Senju Hashirama or when it was inside Mito Uzumaki's body, this so-called strongest tailed beast was quite calm.
At that moment, the group began to prepare. Uchiha Naori, having arranged everything, returned.
Then, everyone started setting up the safety barrier to ensure that even if the operation failed, the Nine-Tails wouldn't rampage and would be forced to maintain the status quo, preventing it from causing damage to the village.
Once everything was ready, in the center of the living room, where the seal was inscribed on the floor, Uchiha Kai and Kushina Uzumaki sat across from each other. Then, Minato Namikaze sat on Kushina's right side, closing his eyes, his right hand placed on her abdomen.
Kushina's cousin, Kikyō, sat on her left side, also with her eyes closed, but simply holding Kushina's hand.
These two were about to enter the sealing space inside Kushina's body with their consciousness. However, without Sharingan, they could only enter by direct contact.
Minato was directly in contact with Kushina's Four Symbols Seal, while Kikyō was connecting through the bloodline resonance of the Uzumaki clan.
As for Uchiha Kai, he activated his Sharingan!
The Uchiha clan members on the outskirts also activated their Sharingan, preparing for defense in a tense manner.
Once everything was ready, Uchiha Kai faced off against Kushina Uzumaki with his Sharingan, immediately unleashing the Mangekyō Sharingan powers he had copied from Obito.
The result?
The immense chakra drain almost caused Uchiha Kai to collapse on the spot.
Thankfully, Uchiha Kai had prepared for this. He immediately activated a skill he had obtained from the system some time ago, instantly feeling full of energy, fatigue completely gone, and both his chakra and vitality maintained at their peak levels.
[All-Nighter: Active skill. After activation, it ensures that the user remains in an excellent state of mental alertness for the next four hours. After four hours, accumulated fatigue and consumption will explode all at once, and the user should sleep to recover. Cooldown time: 72 hours.]
Yes, this was the system's all-nighter skill. Uchiha Kai had received it shortly after acquiring the system, designed to keep the host and their employees working hard on games, draining them equally.
However, in the ninja world, this skill had another effect. Like now, it kept his energy and Sharingan power at their best, and due to the nature of chakra, his chakra recovery speed also skyrocketed during the skill's duration—surging! Increasing! Exploding!
Though this was conceptually a "prepaid" expenditure for future consumption, theoretically, overusing the skill during its active period could lead to death once it ended.
But...
Uchiha Kai declared that the foolish system was still a foolish system, and he had found an opportunity to exploit a bug in the system's other functional cards.
Do you remember the golden item, the Detoxifier, that came from the platinum treasure chest awarded by the system?
This item was a pure system artifact. It couldn't be used outside the system and could only be used by Uchiha Kai. It was stored in the system's backpack.
When Uchiha Kai wanted to use it, he just needed to request it from the system, and it would automatically activate without him needing to take it out.
With thirty uses, the item named "Detoxifier" could actually remove all harmful negative statuses.
Although it couldn't heal injuries or restore physical or mental energy, it was an absolute bug in the system by removing all negative states unconditionally, as if it was a rule-breaking feature.
Once the "All-Nighter" skill is activated, the accumulated consumption turns into a special debuff.
After the skill ends, this debuff bursts all at once, which is considered a removable negative status by the golden antidote.
This made exploiting the bug possible.
During the skill's active period, no matter how much consumption Uchiha Kai accumulates, even if it reaches a level that could kill him countless times, as long as he uses the golden antidote before the skill ends, he will be completely unaffected.
This is basically a mutated version of Golden Experience Requiem!
As long as the power of the antidote reaches its full effect, the true death will never catch up with him!
Most importantly, this antidote can be used thirty times, and since it's a system-produced item, it's possible that more will be obtained in the future, either through another event or from the shop.
This makes Uchiha Kai seem like he has a mutated version of the Eternal Mangekyō Sharingan, and the ability of this Mangekyō is not fixed—if other Uchihas awaken their Mangekyō, he can find ways to copy more abilities from them.
Uchiha Kai doesn't know that Uchiha Setsuna has unlocked the Mangekyō Sharingan yet, otherwise, he'd go to him to copy abilities instead of wasting time with Obito.
What? Why don't the high-ranking Uchiha members tell Uchiha Kai about Setsuna's Mangekyō?
Well, the Uchiha clan's mental state often leads to incredible insights.
Emotional Uchihas are prone to falling into chuunibyou or self-reflection, leading to wild imagination and connections, which often result in groundbreaking wisdom.
For example, Uchiha Setsuna believed that if he told Uchiha Kai about unlocking the Mangekyō and his short life expectancy, it would burden Kai with immense psychological pressure, make him feel guilty, and possibly act rashly.
To ensure that this rare genius of the Uchiha clan could grow up without bearing too many burdens, Uchiha Setsuna, in his self-reflected wisdom, hoped others would help hide this fact from Uchiha Kai.
After his death, his will and Mangekyō Sharingan would be handed to Uchiha Kai.
In that case, Uchiha Kai would definitely understand his good intentions and be moved by them.
Yes, Uchiha Setsuna thought just that, with a rather self-satisfied and emotionally touched mindset, which is classic Uchiha brilliance.
This led to a situation where, despite the Uchiha clan already possessing the Mangekyō Sharingan, Uchiha Kai had no idea about it.
Only when he saw that others seemed unable to activate the Mangekyō did he set his sights on Obito, who in the original story had already unlocked it with just two Tomoe.
If Uchiha Kai knew about Uchiha Setsuna's situation, he'd definitely get a twitchy expression and say, "I thank you!" (in a rather sarcastic manner).
In summary, that's the situation.
Now, Uchiha Kai and his three companions had entered the seal space where the Nine-Tails was kept and saw the strongest tailed beast, the Nine-Tails, tightly bound by chains.
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