Before the Demon Teacher could finish his opening remarks, Dekan had already strolled over to the seats across from the stage and sat down.
"Start singing."
He looked just like a judge, resting his chin on one hand as he leaned back in his chair.
His behavior made the Demon Choir students frown.
Because the most outrageous thing Dekan did was—
He turned the chair around and sat facing away from the choir.
The Music Teacher was silent for a moment, then said, "...Then let's begin."
Since this student was so cocky he wouldn't even give him a chance to finish his opening remarks,
there was no need to explain the rules.
After all, the student had volunteered.
If the kill mechanism was triggered, they could just follow the rules.
The Music Teacher sneered, turned to face the choir, and began playing the large instrument in front of him.
The instrument looked like a piano and sounded like a piano, so Dekan simply assumed it was one.
Well, its tone was just a tiny bit strange.
But as far as Dekan was concerned, tone had never been the most important thing about a piano.
What mattered to him was its structure—
It would make a great barbecue grill, set up beside a swimming pool.
Accompanied by the music, the Demon Choir began singing in perfect unison.
Their song was noisy and captivating in style.
Like the low murmurs of the fallen, or the sighs of a judge, it had an indescribable allure, as though it wanted to draw listeners in and make them lose themselves.
They finished their first run-through in less than five minutes.
Even after they were done, Dekan didn't react in the slightest.
He had no intention of applauding.
All he said, sounding a little dissatisfied, was, "I'm sorry, but I can't turn around in this chair for you."
Dekan sighed and stood up.
"This is how the song goes. I'll only teach it once, so listen carefully."
As he spoke, Dekan walked toward the stage.
The Music Teacher and the Demon Choir students were outraged.
They had never seen anyone so arrogant!
They could overlook the fact that he'd had his back to them.
But they weren't worth turning around for?
And now he was going to teach them how to sing?
What kind of newfangled insult was this?
Was he here to get himself killed?
"Heh."
Several students' expressions grew increasingly twisted, and some even laughed.
As far as they were concerned, Dekan was already a corpse.
Soon, they would show him what true despair meant.
They would kill him brutally as he quivered with fear and resentment.
The Music Teacher also smiled scornfully.
He could hardly wait to kill this clueless student.
What was truly terrifying about this classroom wasn't the kill mechanism, but this group of Demon Students with their twisted minds.
They would do whatever it took to kill any newcomer.
"Are you ready?"
Seeing that Dekan had already taken his place with the Demon Choir, the Music Teacher asked.
"Ready,"
Dekan called along with the Demon Students.
The Music Teacher took a deep breath, placed both hands on the keys, and slowly pressed them down.
The noisy, captivating notes flowed out of the piano, gradually congealing in the air.
The music began to fall like raindrops, its echoes lingering throughout the stage.
Just as the piano piece was about to reach its peak,
and the Demon Choir had just begun to sing,
"We were no strangers to love~"
Dekan's voice made the Music Teacher's hands jerk, almost causing him to hit the wrong note.
All the Demon Students stopped singing and stared at him, dumbfounded.
Not only did Dekan drown out the piano, he even drowned out the entire Demon Choir by himself!
Why?
Because Dekan had taken control of the school's PA system!
He'd turned the Music Classroom's broadcast volume all the way up and was singing the song of his choice into a magic ring he was using as a microphone!
"What are you staring at? You're all singing the wrong notes!"
"???"
The Demon Students looked as if they were questioning their entire existence.
Even setting aside the question of how this guy knew their rules,
why the hell could he control the school's PA system?!
The volume was loud enough to blow their eardrums out.
How were they supposed to sing louder than this bastard?
The Demon Teacher stopped playing too, his face dark as a pot as he looked toward the choir.
"You twenty are all singing it wrong."
The Music Teacher really didn't want to admit it, but he had no choice but to make that announcement.
Those were the rules. The Demon Choir had always used this mechanism to sabotage other Demon Students.
And if the Demon Choir got sabotaged in turn, the teacher had to acknowledge the result as usual.
If the Demon Teacher broke the rules and the principal found out, he would be the one to die.
All the Demon Students stared at Dekan in abject terror.
They realized that something was wrong.
"Ahem. Let's start over."
The Music Teacher cleared his throat twice and spoke with some helplessness.
After giving the students a brief moment to prepare, the piano began again.
This time, as soon as the piano started, all the Demon Students came to an understanding.
They were going to jump the gun and make Dekan mess up—
But Dekan had already predicted their strategy and started singing ahead of them.
"It's changed~"
Dekan raised his head with a blissful look, beaming as he sang.
His was still the only voice in the entire Music Classroom.
"You twenty have made a mistake for the second time."
The Music Teacher, looking out for himself, once again announced the result without mercy.
The Demon Students looked utterly defeated.
There was really no way to deal with this bastard!
If they let him succeed one more time, the entire Demon Choir would be wiped out!
They were doomed if this kept up. They had to risk everything!
"Die!"
At last, one Demon Student panicked and lunged at Dekan.
With one hand in his pocket, Dekan sneered and activated [Mental Interference].
The Demon Student's movements suddenly twisted wildly, and he swung a fierce punch at the Demon Student beside him.
The one who got hit was completely caught off guard and went down hard.
"Teacher! He's attacking another student!"
Dekan raised his hand, looking just like a model student standing up for a classmate, and shouted loudly.
"???"
The Demon Student who'd thrown the punch looked utterly confused, staring at his own hand in disbelief.
He'd clearly meant to kill Dekan!
Why had his body stopped obeying him?
Before he could figure out what had happened,
the Music Teacher sighed, transformed into a streak of shadow, swept across the room, and twisted the rule-breaking student's neck with a sharp jerk.
Then the teacher returned to the piano without a change in expression and sat down on the piano bench, seemingly ready to begin the third performance.
"Heh heh heh. Classmates, let's all get along, shall we?"
Dekan looked at the Demon Students with a meaningful smile.
The three parts provocation and seven parts mockery in his expression seemed to tell them: go ahead and attack, and you'll only die faster.
Before you continue