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The sun reflected on the surface of the river and its white light reflected on the water.
A refreshing early summer breeze with a faint scent of grass. A gentle breeze, like an exhalation stirred the grass of the riverbed, caressed the bangs of the boy standing on the bank. It was a quiet weekday afternoon.
He, Eisuke Tsurugi, took the juice straw in his hand and sipped it noisily. At first glance, he looked quaint
 but anyone who looked closely would notice.
He was dressed strangely in a uniform and denim jacket, and although he had a reasonably well-developed face, his expression with which he looked was so mean that it made him look like a miserable person. And then there was his daring behavior in spending his free time on the embankment instead of going to high school during the week. It would be clear to anyone who saw him that he was no ordinary high school student.
But it didn’t stop there.
As he took a sip of his juice, Eisuke’s cold black eyes looked down the embankment to the riverbed below the overpass.
“P-Please stop
!”
“Hey, it’s okay, come play with us.”
“N-no! Let go of me!”
A high school girl had been surrounded and was being threatened by a group of delinquents with dyed hair and dirty uniforms. She had nowhere to run and burst into tears when one of the delinquents, who was a size larger than her, grabbed her arm and scared her. It was a scene that could almost be called cliché.
Eisuke took the straw out of his mouth and sniffled through his snot. His expression showed neither indignation at such vileness nor sympathy for the high school girl.

On the contrary.
“A perfect day for Yankees[1], huh?” The edge of his mouth twisted as he spoke to himself in amusement. If one had to describe his expression, one could say it was one of anticipation and elation.
Eisuke was not a tall boy. He was rather thin and his height hovered around 170 centimeters, so he wasn’t that tall compared to the delinquents. But he was smiling fearlessly at a situation that most people would have passed over without looking.
Eisuke deftly slid down the slope of the embankment and landed on the riverbed.
“Hey, hey, have fun with me too, you rotten yankees!”
He laughed fiercely and that told them that he was looking for a fight


For a few seconds, the wind blew, then
.
Eisuke took another sip of the juice still in his hand, and let out a sigh. This time, it was more exasperated.
“Haha
 this is just that, a triviality.”
There were bodies. The unconscious delinquents lay in a horrible state at Eisuke’s feet. The scene was like a desert where a storm had passed and everything had been washed away. And so it must have been. The sight of Eisuke tormenting, battering and overwhelming the delinquents. He was just a storm in himself.
By the way
 there was some sort of urban legend that had been whispered lately.
Rumor had it that there was a mysterious guy who picked fights with groups of delinquents and troublemakers for no particular reason, and that he just crushed and destroyed them.
The boy, who could be called the God of Death, wore a blue denim jacket that gave off a strong presence even when blurred by the darkness of the night. The light red stains on his body were said to be the blood of those he hunted.
The “Yankee Hunter,” as he called himself.
His real identity was that of a high school student, Eisuke Tsurugi.
“No, they’re too weak
. too weak to even be worth talking about. I also don’t think there’s anyone stronger out there that I could enjoy more
”
Eisuke shook his head in disgust. The craving for the strong. That was the driving force behind his actions, or rather, his survival. No matter how much power he wielded and no matter how many delinquents he fucked up their day, his heart was never satisfied. Because his real strength was

“Ah
 aah
!”
“Hmm? Oh, right, you were there
” Then Eisuke noticed the presence of the high school girl who was cowering and scared. He casually approached her, “You too, be careful from now on. If it wasn’t for me, you’d be
”
“You monster!”
She shoved Eisuke with a thrust. The juice slipped out of his hand and the ice it held scattered on the floor. But she didn’t look back and immediately ran away. Eisuke was stunned.
“
A monster, huh? Well, she’s not wrong
” He scratched his head and muttered to himself. As he bent down to pick up the plastic cup, he saw a reasonably sized pebble near him. He nonchalantly picked it up and stepped out from under the elevated train tracks into the sunlight. Next, he waved his right arm like a pitcher, “There
 you go!!”. At that moment, he threw it into the sky and the air exploded.
The stone pebble easily passed through the atmosphere at a speed well above Mach 10, and was absorbed by the blue sky.
“
I didn’t intend to throw it that hard
” Eisuke complained with a cold expression on his face.
Eisuke Tsurugi was an ordinary high school boy living in the modern era.
However, the word “ordinary” here only meant that he was born into a normal world, into a normal family, and had lived a normal life.
His growth rate was abnormal, and he was on the borderline of what defined a man from a beast.
He spent his days fighting yankees and troublemakers, training stoically, and before he knew it, Eisuke had acquired a level of strength far beyond that of a human. There was no particular trigger. Simply put, he was a mutant rebel who had grown at an accelerated and unstoppable rate. This was Eisuke Tsurugi’s true identity.
“
Haa, how boring.” Eisuke’s voice came out tiredly.
For him, fighting was a way of life where he could test his strength without any rules. 
But Eisuke could no longer experience the kind of fights that made his heart boil. It was no wonder. If you compared anyone to Eisuke, who had acquired skills far superior to those of ordinary people, no matter how many people there were or how dangerous your weapon was, you’d be no better than a worm, just like the criminals before.
“I wonder if there’s a guy somewhere who’s as strong as a monster
” Eisuke said to no one in particular, annoyed. It would be unbearable to have someone as strong as Eisuke around. His joke disappeared into the air without even getting a punchline.

Or so it was supposed to happen.
‘Finally
 I finally
 found you!!’
“
Huh?”
The “voice” came out of nowhere, and Eisuke looked around warily, but his senses understood why.

The voice had spoken directly into Eisuke’s brain.
“W-who is it
?!” Eisuke held his temples and asked towards the mysterious person. But he got no answer.
Instead, a magic circle with a geometric pattern appeared under his feet.
“What!? W-what the hell is this
!?”
Eisuke was unusually uneasy. The voice echoed in his brain again.
‘We need your power
 please come
 to our world
!’
A strong light shone from the magic circle and seemed to erase all the contours of the world.
“Hey, it can’t be, are you serious? It can’t be
” Eisuke’s vision was tinged with white and disappeared from his world.

He had left. He was going to a world that was much bigger than his small home, and a world that would be more suitable for him.
[1] In this novel, the mc use the word Yankee to refer to thugs.