"Still hasn't shown up, huh?" Naruko
It's been 3 months since the Uchiha Massacre, and Satsuki-chan hasn't shown up at the academy due to the trauma she has endured. Even Naruko was affected by the Trauma, but her trait [Mind Fortress] forcefully calmed her down and helped her reason. Seeing so many people die helplessly in a single night was way too much for the ordinary people. It even made her wonder whether her hate for Satsuki was justified or not.
Since Naruko has watched the Anime and Manga she knew all the stupid things Satsuki is going to do in the future so Naruko hated her for that but in the end of the day she was just a child if track the timeline of Naruto by the time 4th great Ninja war happened Naruto and Sasuke were somewhere around 17 to 18 years old which crazy to think that both Naruto and Sasuke were barely adult at that time.
This is also the reason Naruko was desperately training and relying on her system to create various technique and learn it by creating a Muscle memory for each because doesn't have that much time on her hand plus she needs to come up with a way to train other's too because she knew the being that are going to attack the earth is not something she can handle alone she need an allies competent enough to fight the weakest Otsutsuki in a one on one battle.
"Let's give Satsuki-chan a visit," Naruko said to herself
She knew at this point Satsuki would have come to terms with her parents' death and would be burning with hatred and desire for revenge this something she could exploit and turn her into an ally for the big battle in the future
"You have been skipping the Academy and hiding here in the Hospital," Naruko.
"I said to the nurse that I don't want to see anyone," Satsuki
"Oh, don't be like that, you would really like to hear what I want to say."
"Go away."
"Nope, and you don't want any revenge against your brother for killing your parents. If I were to lose as much as you did, I would have wanted an act of revenge."
"WHAT THE HELL DO YOU EVEN KNOW ABOUT REVANGE I WANT TO KILL, DESTROY HIM AND MAKE HIM SUFFER THE SAME PAIN I DID, WHAT DO YOU EVEN KNOW ABOUT LOSING WHEN YOU HAVE EVERYTHING"
"You are not thinking, let me ask you this then, do you want power?"
"*Sigh* I don't have time to waste on whatever nonsense you have."
"Then why are you wasting your time being couped up in the hospital?"
"You really want to die, don't you?"
"You do know that people call me the 'Demonic Child of Calamity,' right?"
It was one of Naruko's nicknames that Danzo came up with to isolate her from other people and make sure the entirety of Konoha hates her. It's his way to create a distraction so that people can forget all the rumors about him.
"Do you hit your head or something? Or being accused a demon finally got you?" Satsuki
Naruko sighed and then covered the entire room in a seal to make sure nobody can sense the chakra inside of the room using her system and then used her 8-Tri gram seal to borrow Kurama's Chakra the seal was design in a way that it allows naruko to forcefully borrow Kurama's Chakra from him, but the downside was if Her Chakra control was weak then Kurama can take over her body and try to forcefully come out of her but she was using the system to control the chakra so it was completely fine for her.
Naruko, in her Jin clock form, standing in front of Satsuki, releasing a huge amount of energy and killing intent, which overwhelmed her to the point her entire body was shaking from fear in the same way prey fears its predator when it gets caught.
"I will ask again, do you want power for your revenge?"
"Wh--What a--are y--you?"
"Answer me?"
"W--Why H--help m--me?"
"First, answer me, then I will tell you?"
After hearing this, Satsuki tried to calm down and thought about everything, and answered.
"O-Okay, even if I have to sell my soul to a demon for my revenge, it's the gamble I am willing to take."
"Well said."
Then Naruko dispelling the Jin-Clock form looked at Satsuki and started explaining how her training will go from now on this training method was specially designed for her by the System Satsuki-chan's major problem is her low amount of chakra which she needs to focus on for the abilities she will get in the future are Extremely Chakra Taxing for her.
First thing she needed to do was to change Satsuki's Mentality about revenge against Itachi because the death of Itachi was something fated to happen, and the final fight was something both Itachi and Satsuki wanted. Itachi wanted to help her awaken her MS and evolve it into EMS.
The second thing she needed to do was to make Satsuki realize the efforts and benefits of hard work, so she wouldn't get tricked by Orochimaru and blindly follow him in pursuit of power.
"So, do you understand the training regime?" Naruko
"Will I awaken the same power as you with this training?"
"Yes, and no, you will have the power as strong as mine, but inherently different from mine."
"You Sure It won't be just a waste of time?"
"I trained the same way too, and if your Goal is to kill your brother, this much is the Minimum. Along with this, you need to learn more Jutsu that suit your fighting style."
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[Training Regime] (Both Naruko and Satsuki's training are similar)
1. Body weight training (wearing 100 kg leg & wrist weight 24/7 and keep on increasing until body reaches it's limit)
This entitles Physical Exhaustions part of training
2. Book reading (In this you read books about Chakra, literature, Math's, Science, etc. Basically, any anything that requires intense focus and exhaust you mentally)
3. Keep repeating it until you pass out from Exhaustion
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"Let's talk about the Massacre how much do you know about it?"
"....."
"Staying Quite won't change anything tell what do you Know"
"My brother killed the-" Satsuki Stopped mid-way and not able say anything further
"*Sigh* Do you think your brother was alone that night?"
"What? wait you know something right"
"More than you do"
"Tell about it I must know the truth why he did that there must be a reason right"
"All I can tell you that all the Uchiha from Genin and Above were killed by itachi and rest were killed by the orange masked fucker, He also responsible for the death of my parent's"
"weren't you an Orphan"
"Technically yes but I my condition is unique that allow me to remember everything from the moment I was born so I remember my parents and who is responsible for their death"