Konoha: Starting by giving Hinata the Tenseigan!

Land of Fire, Konoha.

Snow was falling heavily in the forest, blanketing everything in white.

A group of five-year-old children were tussling together in the snow. One of them was clearly taking on three at once.

Standing nearby was a little girl with short, dark blue hair. She clutched the hem of her clothes anxiously, watching the fight.

"Damn it, circle around him! Don't let him get away!"

"This nosy punk! If you're so tough, stop running around and I'll knock you flying!"

"Ow…he kicked me! Come on, everybody, all at once!"

"Boom!!! That hurts! Waaaa…Mommy!"

Before long, the three boys who had ganged up on him were crying loudly. Holding their bruises, they stumbled away, sobbing.

"Hoo~~ As expected of the Naruto world. Even little brats here have freakishly strong bodies."

The remaining child brushed off the clumps of snow from his clothes, rubbed his aching fists, and muttered under his breath.

His name was Natsuki, a transmigrator from Earth.

He had found himself in this merciless world of Shinobi, where people refine chakra, practice ninjutsu, and obtain incredible power.

Even kids had remarkable physical abilities.

Yes, he was the same age as those three, and he won despite being outnumbered. But it wasn't an easy victory. Losing face as a transmigrator like this anymore was unacceptable.

It seemed he really needed to activate his cheat.

After all, in this dangerous ninja world, especially in Konoha, he could lose his life at any moment in the crossfire of some battle.

Indeed, after transmigrating, Natsuki had awakened his golden finger. But this cheat power was…not exactly something one can openly brag about.

He'd been secretly trying to activate it by himself this whole time. If anyone found out, it'd be social suicide!

However, the progress bar had been stuck at 99% for years. The final step required revealing it in front of another person.

"Th-thank you… Are you…are you okay?"

The little girl nearby finally mustered her courage, cheeks flushed red.

A small tuft of snow landed on her short dark-blue hair, adding a bit of adorable clumsiness to her look.

Being very familiar with the Naruto storyline, Natsuki of course knew who she was:

Hyūga Hinata, heiress of the Hyūga Clan's main family.

"I'm fine. But you shouldn't be running around by yourself like this. There are bad people everywhere these days."

Natsuki waved dismissively and turned to leave.

"Y-your eye patch fell off…"

A soft, hesitant voice came from behind.

Natsuki stopped in his tracks, taking a deep breath.

"You…saw it?"

"Huh?"

"Did you…see my eyes?"

"Y-yes…I did."

A chilling aura descended. 

Hinata thought she could see an endless dark energy swirling around the small figure in front of her. Trembling, she quickly tried to explain, "They're…really pretty. One gold, one blue."

"Not…not ugly like mine. The boys who were here just now laughed at me…"

"Heh heh…hehehehe. So, in the end, a mere mortal still managed to sense the power hidden in my left eye?"

Abruptly turning around, Natsuki covered his left eye and cut off Hinata's increasingly dejected words.

"As the first person to witness my Eye of Death, you shall become the very first Mage of the Demon God's Seal under me, the Master of Dimensions."

"My true name is Yuhi Natsuki! Welcome to the Dimensional End's Congregation."

"This is the emblem of our Dimensional End's Congregation. Recite my true name, and you shall gain unexpected rewards, even those eyes of yours, brimming with such potential, may evolve."

As he spoke, Natsuki snatched back the eye patch from Hinata's hands and pressed into them a delicate emblem. 

The emblem bore a six-pointed star inscribed on the background of some abyssal pattern.

Seeing Hinata's confused expression, Natsuki, having swiftly re-covered his left eye, spoke with utter seriousness: "What? You don't like my organization?"

Hinata shook her head hurriedly; she had never known how to refuse anyone. "N-no, I don't dislike it."

"Excellent! From now on, you are a member of the End's Congregation. I, the Great One, grant you the title 'Eye of the Daylight.' As for the rest, we'll talk next time. Farewell…"

With that, Natsuki took off at top speed, like a veteran in a hundred-meter dash, vanishing from Hinata's sight.

It was too embarrassing!

So painfully cringey!

It was his first time speaking such embarrassing, chūni lines in front of someone, though at least it was just a little girl who wouldn't understand much of it.

"Agh!!!"

After running a good distance, Natsuki found a tree stump and started punching it hard to vent his embarrassment. He just wanted to peel off his skin and crawl under the snow.

Still, why did he feel an odd rush of exhilaration, like breaking free of convention and giving in to carefree abandon?

..

[Ding!!! Demon King's Eye System fully activated.]

[Before you turn fifteen, each chūnibyō statement you utter has a 30% chance to grant power to yourself or others.]

[Ding! Upon first activation, your left eye obtains the Mystic Eyes of Death Perception!]

..

Natsuki froze, then removed the patch from his left eye, revealing a bizarre blue, patterned pupil.

The world through that eye looked completely different.

It was filled with countless threads, intricately weaving through all things. Natsuki had a hunch that if he simply tore those threads, all of creation would vanish at its very root.

The next moment, an overwhelming pressure surged and Natsuki quickly replaced the patch over his eye…

Meanwhile, clutching the delicate emblem in her hands, Hinata returned to her clan under the watchful escort of family guards who had finally located her.

The more she looked at the emblem, the more beautiful she found it. The young girl was also intrigued by Natsuki's cool proclamation and decided she'd carefully consider it that night…

Because Natsuki had drawn all the aggression and resolved the fight early, creating a butterfly effect, a certain "Child of Destiny" arrived too late. He only now wandered into the little forest…