Nightfall.
The roar of an engine echoed from the distance.
As the sound grew louder, a luxury sports car pulled up in front of the high-end apartment complex.
A moment later, a curvaceous beauty stepped out of the expensive car.
Her entire being radiated the aura of a mature woman.
Her long, jet-black hair glowed under the night lights, her dark eyes exuding a sharp presence.
She walked toward the intercom and spoke with someone inside. Soon, the automatic gate opened, and she entered the elevator, heading straight for the fifteenth floor.
When she arrived, a certain girl was already waiting for her.
"Thanks, Yukino."
The voluptuous beauty gave Yukino a casual wave. Then, she walked toward a specific apartment.
Upon reaching the door, she punched in a code on the electronic lock—without hesitation, as if she already knew the password.
With a beep, the door unlocked.
"BANG—"
She kicked the door open violently.
But inside, there was no reaction.
At the end of the hallway, she saw a silhouette sitting on a sofa, wearing headphones—seemingly immersed in a video game.
The woman's lips curled into a sharp grin. Her eyes sharpened like those of a predator.
She launched herself forward—her powerful strides rivaling those of a trained fighter.
"Killing intent!!!"
Inside the room, Yazuki's eyelids twitched violently.
He felt it, the gaze of a predator hunting its prey.
This wasn't unfamiliar to him. He had felt it countless times before. In the next instant—without even looking—he dropped his console and spun around.
His hand shot out and caught a wrist, inches away from his face.
That hand was formed into a knife strike, had he not intercepted it, it would have slammed straight into his head.
"SMACK—"
A hand, claw-like and sinister, reached toward him. In response, he extended his own hand, fingers splayed, and forcefully pressed against it.
"Oh? Not bad. You disappeared for a while, were you off training in secret, Yazuki-kun~?"
The voice belonged to the beautiful woman who had attacked him. She was smiling warmly at him, but the smile sent chills down his spine.
"It wasn't too bad. But showing up uninvited, breaking into a student's home without permission—that's some seriously bad behavior, Hiratsuka-sensei~"
As he spoke, Yazuki pushed forward with all his might. His opponent did the same, their hands locked in a test of strength, like two bulls clashing in a duel.
Hiratsuka-sensei—full name Hiratsuka Shizuka—was the Japanese language teacher at Sobu High. She wasn't his homeroom teacher, but she also served as the school's guidance counselor. Since he was considered a problem student, she had taken a special interest in "guiding" him. That was how they got to know each other.
Every morning, when he was late for class, he'd go to great lengths to sneak into the school unnoticed to avoid getting caught by the disciplinary staff. However, he often fell into Hiratsuka Shizuka's ambushes and received her "loving guidance" (a beating). At first, he couldn't fight back, but over time, he started resisting. Now, every time they met, it turned into a full-on brawl.
So far, Yazuki had a perfect losing streak.
They were teacher and student, friends and rivals, constantly at odds yet strangely close.
BANG—!
Their heads slammed into each other at the same time.
Without missing a beat, Yazuki's hand slipped down from Hiratsuka's wrist, gliding under her arm. He aimed a direct strike at her chest, which was straining against the buttons of her blouse.
"Hmph, you little pervert!"
Just before his hand made contact, he found himself unable to move forward any further, Hiratsuka had caught his arm in an iron grip. She looked at him with a slightly amused, yet condescending gaze.
Then, without warning, she unleashed strength surpassing even that of a muscular brute. She grabbed both of Yazuki's arms and flung him upward. His entire body lifted off the ground before she swung him back in a powerful suplex.
BANG—!
The impact was loud enough to startle Yukino, who was standing in the hallway. She paled.
Wasn't the teacher being way too rough? If someone didn't know better, they might think she was abusing a student.
Of course, if she had witnessed their usual fights, she would realize that this was actually one of the milder exchanges.
Hiratsuka knew how to control her strength. The moment she made contact with Yazuki, she had already assessed the extent of his injuries. That was the only reason she dared to be this rough with him.
She was furious, not just because he was her student, but because he was also someone she considered an important friend.
He had disappeared without a word, returned injured, and hadn't even bothered to let her know he was back. Did he not realize how many people had been worried about him?
She had only found out from Yukino, who lived across from him. She had even asked Yukino to inform her if he ever returned.
"How about that, brat—"
Before she could finish, she was forced to release him.
Yazuki was struggling like a madman, twisting his arm with such recklessness that she had no doubt he would actually break it if she didn't let go.
And then, she felt it.
A sense of danger.
In that instant, Yazuki's entire demeanor changed. He wasn't just resisting anymore, he had transformed into something else.
A beast.
A predator.
Her instincts screamed at her to move.
The moment she let go, she flipped backward.
BOOM—!
His fist, like a sledgehammer, smashed into the floor where she had just been standing. Blood splattered from his knuckles.
The wooden floor cracked from the sheer force of the impact.
Hiratsuka looked into his dark, piercing eyes.
Gone was the usual careless, lazy, and somewhat childish glint. Now, his gaze resembled that of a savage beast lurking in the darkness.
Then, he lunged at her.
BANG! CRASH! THUD! BOOM!
The living room was wrecked in seconds. It was as if a hurricane had torn through it.
Their battle looked less like a playful spar and more like a deathmatch in an underground fighting ring.
Sweat dripped down Hiratsuka's face.
The person before her, this was no longer the mischievous problem student she knew.
This was a killer.
Every attack he launched was laced with murderous intent.
Every move was honed, refined—lethal.
This wasn't something a high schooler could learn through practice alone.
How many real battles had he been through?
CLANG—
Yazuki froze for a moment, staring at the shard of broken glass in his hand.
Then, he let it slip from his fingers. It hit the floor with a crisp sound.
"Let's end the joke here. You scared, old hag~?"
He ran a hand through his hair and flashed a mischievous grin, throwing out a taunt he knew would make Hiratsuka snap.
But if he could see himself in a mirror right now, he'd notice—
His grin was stiff. Forced.
"A joke?"
Hiratsuka's voice was ice-cold.
Her hands trembled with rage.
Not because of his words.
But because he was hiding something.
She clenched her fists so tightly that her nails dug into her palms.
In a split second, she closed the distance to zero.
This punch—normally, it would send this brat flying, make him wail in pain.
But just before she struck him—
She stopped.
Instead, she pulled him into an embrace.
PTSD.
The word echoed in her mind.
Post-Traumatic Stress Disorder (PTSD) occurs when an individual experiences, witnesses, or is confronted with one or more traumatic events involving actual or threatened death, serious injury, or a threat to physical integrity. It results in delayed and prolonged psychological distress.
Yazuki was showing all the signs.
"Mmghh—mmph! (Let go already!)"
Yazuki struggled in her grip, his voice muffled.
He tried to push her away, but she only held him tighter.
Damn it—this monster of a woman!
In the end, he resorted to desperate measures, his hands reached out and grabbed whatever was suffocating him.
His fingers sank into something firm, yet soft and incredibly elastic.
Boing.
"…?!"
Hiratsuka squeezed even tighter.
His neck was about to snap. He couldn't breathe. His vision blurred.
Instinct kicked in. He struggled, flailing, his hands moving randomly—
Then, he heard it.
A strange, almost cute noise escaped her lips.
And so, the Demon King who had conquered hundred different worlds suffered his third defeat—at the hands of his teacher's boob power.