But right after that, Natsuki's expression suddenly turned serious, and he said in a deep voice, "However, because we gain power too quickly, there is a huge hidden danger within it."
Rengoku immediately asked, "What danger?"
Natsuki explained slowly,
"That is, it's easy to lose yourself."
"Especially when you train to the level of high tier Kekkei Mora, your humanity will gradually be worn down and devoured."
"If you go even further, reaching the quasi Star God or Star God realm, your humanity will fade away even more."
"Once your humanity is completely gone, that is no different from another form of death."
"When you lose your humanity, you will only blindly chase power and energy. In the end, you will become a rule yourself and merge into the vast universe."
Hearing this, a chill rose in Rengoku's heart, and he could not help but shiver.
After all, he had only been in this mysterious world for four short years.
Yet in that time, he had already awakened and mastered the Eternal Mangekyo Sharingan.
As someone with a cheat ability, part of the so called Fourth Calamity, he had never doubted how quickly his strength could skyrocket.
But now, he truly realized how important humanity was.
The problem was, how exactly was he supposed to preserve that precious humanity?
On that point, Rengoku had no idea at all.
As if sensing the confusion in his heart, Natsuki suddenly asked a surprising question.
"Ever since you came to this world, have you always upheld good moral character?"
He looked straight at Rengoku.
Caught off guard, Rengoku paused for a moment before answering honestly, "In my original world, I was a teacher."
"Oh!"
Natsuki raised his brows slightly, showing a look of sudden understanding.
"No wonder."
Seeing this reaction, Rengoku became even more confused.
"What does that have to do with me being a teacher?"
Natsuki smiled calmly and explained, "The best way to hold on to your humanity is through the Seven Deadly Sins."
"Because they are the things that most strongly stimulate human emotions and desires."
"It's those intense emotional fluctuations that let us constantly feel our own existence, and use that to resist the force that erodes humanity."
"You guard your morality too well. Or maybe you still don't fully identify with this world."
"That results in too little emotional fluctuation."
"With such a calm and steady mindset, it will be very hard for you to break into higher realms."
"And I don't want to be missing a reliable ally at a critical moment in the future."
Rengoku knew the Seven Deadly Sins.
Lust, gluttony, greed, sloth, wrath, envy, pride.
He cast a slightly strange look at Natsuki and Haku beside him.
"So which one are you using?"
Natsuki rolled his eyes at him. Of course he knew what Rengoku was thinking.
"I said use the Seven Deadly Sins, not that you're limited to just one."
After a short pause, he continued, "For example, gluttony, sloth, pride. Those are the ones I use more often."
"And all kinds of love work too."
"Even hobbies outside the Seven Deadly Sins are completely fine."
As he said this, his gaze unconsciously drifted to Haku beside him, his eyes softening.
"In this ninja world, there are many people I deeply care about and love. Haku is one of the most important among them."
Hearing that, Haku's calm face instantly bloomed into a gentle and secure smile.
Seeing this, Rengoku nodded thoughtfully.
After all, as a former teacher, he was not unfamiliar with such emotions.
"My hobby is shipping couple pairings. The kind where I force it if I have to."
The moment Natsuki mentioned shipping couples, he became visibly excited. His eyes practically lit up.
"You have no idea how amazing 'Boro' is to ship!"
Before he could continue, Rengoku quickly raised his hand and made a firm stop gesture.
That look in Natsuki's eyes was far too familiar to him.
It was exactly the same look his students used when they crazily tried to sell him on some CP.
Rengoku hurriedly cut him off and changed the topic.
"Wait. If you love shipping 'Boro' so much, why did you throw Boruto out?"
Natsuki paused slightly, then smacked his lips as if still savoring something.
"I didn't just throw him randomly."
"If it's 'Boro,' then of course they have to be together to truly count as 'Boro.'"
"So I helped him recover the memories of going through hardships with Uchiha Hikari, and then I tossed him back to the early Warring States period to meet her."
After hearing that explanation, Rengoku's eyes widened. He stared blankly at Karasuki floating in the middle of the platform.
"But he didn't take Karasuki with him. Without it, how is he supposed to come back?"
Natsuki shrugged indifferently.
"If he can't come back, then he doesn't come back. At his age, he's just useless anyway. More trouble than help."
Rengoku let out a dry laugh.
Now he truly understood what Natsuki meant by pride and being obsessed with shipping couples.
Just because he wanted to see Boruto and Uchiha Hikari as a couple, he casually threw Boruto into the distant early Warring States era without a second thought.
He did not even care whether Boruto's family would look for him. As long as he was satisfied, that was enough.
People who love shipping couples really are unreasonable.
At that moment, Natsuki reached out and patted Rengoku on the shoulder, smiling reassuringly.
"Don't worry so much. You can just go pick Boruto up later."
"Anyway, Karasuki can choose a specific time. Just set it to a few days after."
Rengoku's lips twitched.
Natsuki really had thought it through.
With barely any time passing, future Naruto would gain a mature, sensible, obedient son, and even a daughter in law.
And Natsuki would get his beloved couple pairing fulfilled.
A perfect score solution.
'As expected of you, Natsuki.'
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