Welcome To Demon School ! Iruma Kun 『 Sasuke Uchiha 』

In the dark, under extreme pressure, Iruma found himself surrounded by an oppressive atmosphere.

What do you think—will he be scared? Will he be traumatized?

No.

He was not scared. Neither was he happy.

Rather, he was quiet.

The heavy air, the demonic presence enveloping him, the wicked aura that coated the entire school—none of it made his heart tremble. Not because he was brave, but because his heart was upset. His soul already burned. His resolve had already been forged.

This place—Babyls Demon School—a prestigious institution in the demon world, known for shaping elite demons. It was a breeding ground for descendants and those destined to study under the next Demon King. A place filled with bloodthirsty monsters, deceivers, manipulators, and kings waiting to be created.

Now you may wonder: how did a human end up in the demon world?

__

[One week ago.]

He was training. Alone. Under the starlit sky, in the ruins of his old training field—the very same place where his master once stood, correcting his stance, meditating beside him in silence, smiling gently after each grueling session.

( Six months ago, a being arrived. A Satan, a demon—or perhaps an Angel ?

One that didn't belong to Earth. That being... that just killed his master.

How did Iruma know this? Because of his Rinnegan! He could sense the essence of beings and identify them! )

Now, back to his master—who had been kind and gentle to him, like a father figure. And now he was gone. Iruma , knowing this, felt nothing but self-loathing for being weak. Despite possessing immense power unlike other humans, he felt powerless. He hated himself to the point of blaming his own weakness; despite having supernatural abilities like the Sharingan and Rinnegan or the inner Will [chakra] , he had done nothing. He was weak, pathetic—just like the old Sasuke.

----

 Back to one Week earlier,

As Iruma trained relentlessly, the weight of his burden pressed down on him like a heavy shroud. Each day, he pushed himself harder, drawing from the depths of his past knowledge and experiences. He was determined to become stronger, to overcome the limitations of this new body that seemed to bind him in ways he never anticipated.

One particular frustration growing at him: the inability to refuse anyone's request. In this form, he found himself unable to say no, a vulnerability that irritated him to no end. It was a weakness he could not afford. But what can he do ?

So he did ..

With unwavering resolve, Iruma focused on honing his instincts. He trained day and night, developing the ability to analyze the intentions of those around him. If someone approached him with ill will, he would sense it—a warning bell ringing in his mind. He could reject their advances, stand firm against their malice. And say to them " NO " .

Yet there was a paradox that troubled him. When faced with pure intentions, with those who held no desire to harm him, he felt an inexplicable compulsion to comply. It was as if an invisible force compelled him to accept their requests without question.

This was particularly not true for his parents—his mother and father—whose greedy and selfishness were so profound that he couldn't bear to say no to them because they were his mom and dad.

And so, Iruma continued his training, striving to master this duality. He would become stronger, not just physically but mentally and emotionally. The path ahead was fraught with challenges, but he would face them head-on. He would carve out his own destiny, refusing to be shackled by the burdens of his past or the limitations of his present.

But suddenly bald human like being just came in brust of gray smoke he dose have two horn in his head . and a tale like arrow .

He said to Iruma , " I am a demon . And your parents sold Your soul to me so now you are mine"

Now, Iruma was lost in thought, feeling the raw pressure of the demon looming over him. Fear gripped him, but he quickly steeled himself, a hint of sadness glimmering in his eyes.

"So, are you going to kill me now? If you are, then just do it. I do not fear any demon, nor will I bow to them."

The demon replied, "Well, I never intended to do something like that, and I will not let you leave this place."

---

"Now that I think about it, we are ready!"

The demon squished Iruma's hand, and out of nowhere, a soft chair with two horns appeared, causing Iruma to find himself sitting on it.

"What the hell is this?" Iruma asked.

"It's the unlimited super deluxe pampering set!" the demon replied.

"You see, I'm actually a bachelor, but I've always dreamed of having a grandchild!"

The demon sat in front of Iruma, grabbed his hand softly, and said, "Well, Iruma, will you be my grandson?"

He then started crying, telling Iruma that all his friends and companions had grandchildren, but he did not. He promised Iruma that he would spoil him just like grandpas do with their grandchildren. Then he began begging Iruma to accept him as his grandpa.

What happened next? Iruma signed a contract stating that from now on, he would be the demon's grandchild. While Iruma was also confused about why he accepted in the first place, he realized that it was because the demon had no ill intentions toward him and was purely asking him to be his grandson.

---

Iruma sat in the plush chair, completely bewildered by the sudden turn of events. The menacing demon he had expected to face was now a tearful figure, clutching his hand with an earnestness that was almost endearing.

"Wait, are you serious?" Iruma asked, trying to process what was happening. "You want me to be your grandson?"

The demon nodded vigorously, wiping away his tears with the back of his hand. "Yes! I promise to take care of you, spoil you with treats, and tell you all the best stories! You'll never be lonely again, I swear it!"

Iruma felt a strange warmth in his chest. The idea of having someone who genuinely cared for him, even if it was a demon, was oddly comforting. He glanced at the demon's hopeful face and couldn't help but feel a twinge of sympathy.

"Okay, I guess… I can give it a try," Iruma said hesitantly. "But no weird rituals or anything, alright?"

The demon's face lit up like a child on their birthday. "Oh, thank you! Thank you! You won't regret this!"

With that, the demon produced a scroll from thin air. "Now, we just need to sign this contract to make it official!" He handed Iruma a quill that glimmered with an otherworldly light.

Iruma took the quill and hovered it over the parchment, pausing for a moment as he thought about what he was doing.

"Is this really what I want?" he wondered. But looking at the demon's eager expression, he felt a surge of courage. Maybe this was an opportunity for something new, something different from the life he had known.

He signed his name with a flourish, feeling a strange connection form between them as he did. The moment the ink dried, a warm glow enveloped them both.

"Welcome to the family, my dear grandson!" the demon exclaimed, pulling Iruma into a tight embrace. Iruma chuckled nervously, feeling slightly overwhelmed but also oddly happy.

As they settled into their new dynamic, Iruma realized that while he had entered this situation expecting danger, he had found an unexpected bond instead. Perhaps being a grandson to a demon wasn't so bad after all.---

The demon snapped his fingers and declared, "Well, now it's decided!"

In an instant, he presented Iruma with a stunning outfit—one that perfectly matched his desires. The Dark navy cloak draped effortlessly over Iruma's shoulders, its hem intentionally torn for style and freedom of movement. Beneath it, a close-fitting uniform hugged his frame—black from collar to boot, designed for speed and precision. Around his neck, a custom collar took the place of a forehead protector, engraved with a crescent moon sigil that gleamed softly.

Iruma gazed into the mirror, the cloak fluttering behind him like a shadow given life. For the first time, he didn't look like a demon; he looked like his old self. The only differences were the striking blue of his hair and eyes, yet everything else remained the same—his height, his shape, even his distinctive way of speaking.

Iruma couldn't help but smile. This was him in a new form, ready to embrace whatever challenges lay ahead.

"Hey, Grandpa," Iruma asked, his excitement bubbling over. "Did you see my sword?"

His grandpa chuckled, a twinkle in his eye. "Yes, I did. You were training when I brought you here, so I went ahead and grabbed your sword. It's a straight sword without a shield, right?"

Iruma beamed. "Isn't that cool? It's called the Sword of Kusanagi (草薙の剣)."

『 Its Like Sasuke sword in Boruto. Which was later used by Boruto . 』

His grandpa nodded, the pride evident in his voice and poker face. "I know my little Grandson secret—you possess power, something supernatural. There are many elite humans who share that kind of strength to defeat against Demon world "

Iruma scratched the back of his head, a sheepish grin on his face.

"It's not quite like that. But…" He hesitated, glancing at his grandpa, who was now pointing to his eyes. One was hidden beneath his hair, while the other gleamed with a mysterious light.

 Iruma throught ''That old demon… he observed me for a week before bringing me here to become his precious grandchild."

With a knowing smile, his grandpa continued, "And remember this: I've cast a magic spell on your Rinnegan. Now, it will activate automatically as your Sharingan whenever you need it. When you don't require its power, it will remain dormant."

Iruma's eyes widened in surprise. "Really? That's amazing!" He felt a surge of confidence wash over him. With his new form and abilities, he was ready to face whatever challenges awaited him in this strange new world.

---

Then he grabbed his sword and secured it to his belt at his waist. He then asked, "Now tell me, why did you bring me here? You must have a reason, right?"

The old demon replied, "Yes, my grandchild. I brought you here to enroll you in a demon school."

Iruma responded, "...?"

"If you refuse, I will eat you."

"Okay, okay, old man."

"Call me grandpa."

"Yeah, yeah, grandpa."

 " From tomorrow You will be attending School, Iruma... KUN" jumping all around the place with small egg shape with poker face.

Iruma, " What!?"