I, the spiritual mentor of beautiful girls from all over the world

His name is Gavroy.

He is a demon reincarnated from a human. In his previous life, he was a notorious warmonger in the world of World War I. Due to his cruelty and powerful potential for divine artifacts, he was chosen by the head of the Nabelius family and given the castle as a pawn.

"Damn it!" Gavro slammed the metal goblet in his hand onto the table with a loud bang.

"Last time, we used so many people and wasted so many resources to catch that little wildcat, and she still got away! It was an absolute disgrace!"

"Boss, calm down. That traitor is very cunning. But as long as she dares to show her face, the credit for this SS-level wanted poster will be yours sooner or later." The lower-ranking demon next to him quickly smiled obsequiously.

Gavro wiped his mouth, a greedy grin spreading across his face.

"Her merits are secondary; the key is her bloodline! The patriarch has been eyeing the sisters' potential for a long time. If we can capture her alive..."

Before he could finish speaking, the heavy stone door of the fortress exploded inward with a loud "boom".

Amidst the billowing smoke and dust, a petite figure slowly walked in.

Her tattered kimono had been replaced by a brand-new black outfit that accentuated her slender figure.

Her long black hair flowed behind her, her black cat ears twitched slightly, and her golden eyes, in the firelight, were devoid of any warmth.

"Black Song?!"

Gavre stood up abruptly, his greed instantly turning into astonishment and wariness.

He couldn't understand how this traitor dared to come back alone.

How did she manage to break through the outer perimeter security?

“Gavre,” Black Song’s voice was soft, yet it reached the ears of every demon clearly.

"I remember, wasn't it you who branded my sister's back with a hot iron?"

Gavre's expression changed, then he sneered, "So what if it is? Isn't it only natural to mark a precious experimental subject?"

"The fact that I didn't kill her outright is already the greatest mercy the patriarch has shown! You traitor, now that you've walked right into our trap, don't even think about leaving!"

He roared, and his entire body's magic power erupted instantly, spreading out a heavy pressure belonging to the [Castle] chess piece.

"You bunch of useless trash, surround her and don't let her escape! Today, I'm going to tear her to pieces with my own hands!"

The moment he finished speaking, a menacing, jet-black arm armor covered with cannon muzzles and ominous patterns instantly covered his entire right arm.

At the core of the arm armor, a red crystal emanated a destructive aura.

This is his divine weapon—the Arm of the Tyrant.

At his command, all the guardian demons within the stronghold surged out, and more than a dozen beams of magical light of different attributes lit up, sealing off all of Black Song's escape routes.

Faced with this display of power that would make any demon of the same level despair, Black Song's expression remained unchanged.

She didn't even fully utilize her magic and divine powers.

Just as those magic bullets were about to hit her, she moved.

There was no violent outburst of energy, no dazzling magical effects.

She slightly shifted her body to the side, at an unbelievable angle, and just barely dodged the three magic bullets that were shot in a triangular pattern.

The movement wasn't even fast, but it was so precise it seemed to have been calculated hundreds of times.

Then, she took a step forward.

This step was precisely timed to coincide with the fraction of a second that Gavr had left after activating the artifact and unleashing his magical power, during which his aura began to return to normal.

"what?!"

Gavrell only felt a blur before his eyes, and the petite figure had already broken through everyone's blockade and arrived in front of him.

too close!

He wanted to retreat, to create distance, and to use his most proficient skill, the Tyrant's Arm, to blast his opponent into dust.

But to his horror, he discovered that the flow of magic within his body was as if it had been stuffed with a wad of cotton, becoming extremely sluggish.

Every movement and every glance from his opponent landed precisely on the point where his power was most out of balance.

The feeling was like a master chess player toying with a child who only knows how to run wildly.

"Impossible... Your power, why..."

Gavre was left speechless.

Because a fair hand had already lightly touched his chest.

That hand looked weak and powerless, yet it contained an extremely refined power that he couldn't comprehend.

"puff."

A soft sound.

There was no earth-shattering explosion, and not even much energy was dissipated.

Gavre looked down, staring incredulously at his chest.

A small hole appeared there; his heart had been completely pulverized by a spiraling energy.

Life is fleeting.

The moment he fell, the arm armor artifact on his arm transformed into a faint light and detached from his body.

Hei Ge reached out and easily grasped the light in his hand.

Warm energy pulsed in her palm; this was her first "offering."

Only then did the surrounding demons realize what was happening.

They looked at their leader's gradually cooling corpse, and then at the black cat that was unharmed and whose breathing was perfectly steady.

A fear originating from the very soul instantly gripped them.

Is this person really the same Black Song who only knows how to bite with brute force?

This way of fighting... they had never seen it before, nor could they understand it.

"monster……"

Someone shouted first, and the remaining demons scattered like birds and beasts, fleeing in all directions in terror.

Hei Ge didn't chase after him.

She simply gazed quietly at the spoils in her hands, her heart filled with an almost religious reverence for the owner.

This is the power of "knowledge".

In just ten days, she was completely transformed.

Two hours later, the highest-ranking demon of the Naberius family arrived late with reinforcements.

They were met only with a cold corpse and an empty outpost.

……

The underworld, the main branch of the Naberius family.

The atmosphere inside the magnificent palace was terrifyingly oppressive.

The current head of the family, a middle-aged demon with a sinister face.

He was staring intently at the report in his hand, his face, which always wore a fake smile, now contorted with anger and fear.

In his hand was a castle chess piece, which he held tightly in his hand.

The surface of the chess piece is full of cracks and dull.

It is no longer usable.

"Gavre... is dead?!"

"Yes...yes, Master." The demon who came to report knelt on the ground, his body trembling like a leaf.

"There was only one fatal wound, located in the heart, and it was very... clean and swift."

"There was almost no trace of energy outburst at the scene, it was like...like the heart had been precisely removed."

Clean and efficient...

These four words, like a cold awl, pierced the mind of the Nabelius family patriarch.

He knew Black Song's fighting style better than anyone else.

Fierce, savage, and filled with a destructive desire.

Like a wild beast driven by instinct.

Every time she fights, she leaves the battlefield in a complete mess; that's just her style!

And now, this "clean and efficient" method of killing...

There is only one possibility.

Black Song hasn't gotten weaker; he's become a hundred times more terrifying than before!

She has learned how to perfectly control her power!

That escape was definitely backed by an unimaginable force!

This is not just simple revenge; it's a plan!

A premeditated assassination plot targeting his Nabelius family!

The thought of the terror of that unknown existence, coupled with Kuroka's absurdly rapid growth rate...

A chilling feeling, as if he were being watched by a apex predator, instantly shot from his tailbone to the top of his head.

No!

This matter absolutely cannot be left for him to bear alone!

Driven by extreme fear, the head of the Nabelius family no longer cared about saving face.

He immediately activated the highest-level emergency communications, directly connecting to the office of the Demon Lord Sirzechs Lucifer.

With a flash of light, Sazex's handsome yet dignified face appeared in the communication crystal.

"Lord Naberius, what urgent matter is there so late?"

"Lord Lucifer! Something terrible has happened!"

The head of the Naberius family almost roared it out, his face filled with exaggerated grief and terror.

"Traitor Black Song! She's back!"

“This time, she has committed a crime even more serious than ‘killing her master’!”

"She colluded with an evil god from another pantheon, and that evil god granted her terrifying power!"

"Right now! She is carrying out a planned massacre of our seventy-two pillars of nobility!"

"This is a subversion of the entire order of the underworld! It is a blatant provocation against your majesty as the Demon King!"

He embellished the story, twisted the truth, and attempted to escalate his personal grudge to the level of the safety of the entire underworld.

"Your Majesty, please issue the order immediately to carry out the highest-level extermination of that audacious and despicable traitor!"

On the other end of the communication crystal, Sazex listened quietly, his eyes calm and still beneath his long crimson hair.

The silver-haired maid, Grefia, standing behind him, frowned almost imperceptibly.

Sazex didn't believe a single word the patriarch of the Nabelius family said.

However, he astutely captured several key pieces of information.

Black Song is back.

Her fighting style has changed.

Behind this, a mysterious "fourth force" is involved.

This perfectly matches the mysterious "divine realm" that suddenly appeared and disappeared ten days ago.

The light from the communication crystal dimmed, and the majesty and composure befitting a demon king slowly faded from Sazex's face.

Instead, there is a sense of solemnity and focus that chess players have when facing an unknown game.

The silver-haired maid, Grefia, standing behind him, stepped forward, her voice steady.

"Lord Sazex, Lord Nabelius is exaggerating, but the changes in Black Song are indeed true."