Demon Slayer: The Great Swordsman's System, Disciple of Yoriichi

Seeing Si Shu trespass on their territory, the demons lunged without hesitation. Holding his Nichirin Blade horizontally, Si Shu took a step forward.

"Waltz!"

He unleashed the First Form, and a horizontal slash wreathed in flames sliced off the first demon's head. After eliminating it, Si Shu surveyed his surroundings. There were still fourteen demons encircling him. Although they were newly transformed and had not yet adapted to their Blood Demon Arts, their numbers were still a problem. Even if he could take them out one by one, it would take some effort. By then, Muzan and Kokushibo might catch up.

I have to end this quickly.

Gripping his sword with both hands, Si Shu knew this was the moment that would decide his fate. If he succeeded, he would live to pass on the news of Michikatsu's transformation. If he failed, death would be his end, and everything that came after would have nothing to do with him.

With his back to a wall, he took a deep breath.

"Eat him!" one demon roared, charging at Si Shu. The others, unable to resist their craving for human flesh, all attacked at once.

With a sharp glint in his eyes, Si Shu moved. He shifted his feet, rushing out with a rhythm no ordinary person could comprehend.

"Sun Breathing, Eleventh Form: Dance of the Sun Halo Dragon Head!"

The Nichirin Blade danced in the air, like a great dragon of fire taking flight. Upward slashes, downward chops, horizontal cuts, diagonal flicks. Surrounded and attacked from all sides, he dodged every single blow, remaining completely unscathed. A fiery dragon danced, and a high-speed combination of attacks continuously landed on the demons' bodies.

With a final flash of movement, Si Shu appeared behind one of the demons. All the demons froze, as if their pressure points had been struck.

Squish.

With a faint tearing sound, a crack appeared on the neck of every demon. One, two, three... a total of fourteen heads fell to the ground one after another.

With a single attack, Si Shu had eliminated all the demons surrounding him.

Phew. Just as he thought he was safe, a figure suddenly shot towards him from the distance.

"Moon Breathing, First Form: Dark Moon - Evening Palace!"

Kokushibo had arrived! Faced with a draw-and-slash technique so fast it was nearly invisible, Si Shu could only hold his Nichirin Blade vertically in front of him as a temporary block.

CLANG! CLANG! CLANG!

Though it was just a single slash, Si Shu heard the sound of blades clashing a dozen times. Not only that, but his upper body was struck at the same instant. It felt as if countless tiny blades were cutting him, and his face, chest, and arms were covered in various cuts. An immense impact sent him staggering back.

After forcing him back, Kokushibo did not press the attack. Instead, he spoke. "So it really is you, Si Shu."

"Ah, long time no see... Senior Uncle." Wiping the blood from his face, Si Shu gave a cold smile. "Or should I call you... Kokushibo?"

"I am a demon now. Everything from my time as a human is irrelevant." Shaking his head, Kokushibo suddenly extended a hand towards Si Shu. "What do you say, Si Shu? Why don't you become a demon too? If you do, you can have eternal life and immense power."

As he spoke, Kokushibo released a powerful aura, pressing down on Si Shu. He intended to use the pressure to force Si Shu's hand! Under pressure, people are prone to making impulsive decisions. If Si Shu's psyche showed even a single crack under Kokushibo's pressure, he would be one step closer to death.

"Ugh..."

Facing Kokushibo's immense pressure, beads of sweat formed on Si Shu's forehead. As a human, Michikatsu was already the second strongest in the Demon Slayer Corps. After becoming a demon, his strength had increased severalfold. Si Shu's breathing grew ragged, his blood flow accelerated, and his heart began to pound faster and faster.

But even so, the look in his eyes as he stared at Kokushibo did not change. It remained firm, without a trace of hesitation.

A flicker of anger appeared on Kokushibo's face, and he gritted his teeth. "Si Shu, I will ask you one last time. Become a demon!"

His aura intensified, and even greater pressure washed over Si Shu. Under this unprecedented pressure, Si Shu's body began to change. His skin turned slightly red, and steam began to evaporate from his pores. The heart in his chest pounded wildly, as if it were about to explode.

His body temperature was rising. His heart rate was accelerating.

Noticing the strange change in Si Shu, a flash of doubt appeared in Kokushibo's eyes. In his human days, he seemed to have experienced something similar. Could it be...?

Suddenly, a guess formed in his mind. Not good!

He stopped releasing the pressure and swung his blade.

"Moon Breathing, Sixth Form: Perpetual Night, Lonely Moon - Incessant!"

Kokushibo unleashed a dense and rapid series of slashes at Si Shu's position. Countless crescent blades flew out, carving the earth into fine dust. The air filled with flying dirt, obscuring Si Shu's figure.

Just as Kokushibo was wondering if Si Shu was dead, a flame slash suddenly flew out. Then, Si Shu's figure appeared in mid-air, launching an attack.

"Sun Breathing, Tenth Form: Beneficent Radiance!"

A spiral-shaped flame slash descended from above, aimed at Kokushibo. The blade, wreathed in fire, chopped down mercilessly at his neck.

I can't dodge! Instantly judging that he couldn't evade, Kokushibo was forced to use a defensive technique.

"Moon Breathing, Fifth Form: Moon Spirit Calamitous Eddy!"

Spinning his body, Kokushibo created a massive vortex of slashes around himself. The giant vortex of blades and the flame slash collided, creating a deafening explosion. The impact kicked up a cloud of dust several meters high.

In the distance, Muzan stood silently on a tree, watching the town. After the explosion and the dust settled, a cold smile appeared on his lips. "Looks like it's almost over."

Crash... crash...

Debris from the houses blown into the air by the explosion rained down, making it almost impossible to see the center of the blast. A night breeze finally blew the dust away.

"You really... did awaken it," Kokushibo said, his voice tinged with amazement. He was not in good shape. His left arm was severed at the root, and the right half of his face was gone. There were three large holes in his torso, and his body was covered in burns.

Opposite him, Si Shu's appearance had also changed dramatically. His upper body was bare, and several thumb-thick, black-and-red lines snaked out from his heart, extending up to his face. On his right forehead was a deep, claw-like mark.

Si Shu had awakened his Mark!

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