I'm in a crossover anime world, and I've been transported to Hogwarts twice.

The night was as dark as ink, and thick, dark clouds completely obscured the moonlight, plunging the entire mountain forest into suffocating darkness.

Only the occasional mountain breeze rustled the treetops, making a soft, whispering sound, like some ominous premonition.

The air was filled with the damp smell of earth, mixed with a faint whiff of blood, putting everyone's nerves on edge.

"keep alert!"

Rengoku Kyoujuro? Kyu [Ling Sulfur Residue Shrimp Two Bar] lowered his voice, his golden eyes flashing with a cheetah-like alertness in the darkness.

His right hand never left the hilt of the Nichirin Blade, his knuckles turning slightly white from the force.

The ten Demon Slayer Corps swordsmen behind him immediately dispersed with skillful tactical movements, each adjusting their breathing rhythm to its optimal state.

The Nichirin Blade trembled slightly in its sheath, as if sensing the impending danger.

Sanemi Shinazugawa walked at the front of the group, his white spiky hair standing out in the darkness.

He twitched his nostrils like a hunting dog, then suddenly frowned: "There's a bloody smell, very close."

Before the words were finished, a black shadow as fast as lightning shot down from the dense canopy of the "627" tree!

"careful!"

Kyojuro Rengoku's roar echoed through the mountains and forests, and his Nichirin Blade was instantly drawn, its flame-like light slicing through the darkness.

However, the dark figure was too fast.

The outermost team members only had time to show a look of horror before a sharp ghostly claw pierced their chests, and scalding blood gushed out like a fountain, turning an eerie dark red under the moonlight.

"It's the waning crescent moon of the Twelve Demon Moons!"

Shinazugawa roared and charged forward, unleashing the sword energy of the Wind Breathing Fourth Form, which tore through the air and left deep trenches in the ground.

But the ghostly figure had long since vanished like smoke, leaving only the gradually cooling corpse of its companion and the heavy smell of rust in the air.

"Array up!"

Kyojuro Rengoku's voice was steady and powerful.

The Demon Slayer Corps members immediately formed a defensive circle back to back, their Nichirin Blades gleaming coldly in the darkness.

Just then, six figures slowly emerged from the shadows of the surrounding trees, their scarlet eyes flickering like will-o'-the-wisps in the darkness, radiating a chilling malice.

"Good evening, everyone from the Demon Slayer Corps."

A demon with medium-length black hair, the ends of which had a gradient of rose red and blue-green, and three large yellow squares and three small yellow squares tattooed on its cheeks, spoke elegantly, its voice carrying an unsettling pleasure, "The Lower Moon One, Enmu, is pleased to meet you before your deaths."

The battle broke out in an instant.

The six Lower Moon demons launched an attack simultaneously, and the Demon Slayer Corps was immediately plunged into a fierce battle.

Kyojuro Rengoku's Flame Breathing Fifth Form, Flame Tiger, along with Lower Moon One and two other Lower Moons, intertwine blazing flames and jet-black demon blood, bursting into deadly sparks in the night sky.

Sanemi Shinazugawa blocked the other Lower Moons, and each collision between the wind blades and the demon claws produced a piercing metallic clang that made people's eardrums ache.

As for the members of the Demon Slayer Corps, they were there to deal with the ordinary demons that appeared.

"Hold on! Reinforcements are on their way!"

Kyojuro Rengoku, who was locked in combat with three Lower Moon demons, shouted to boost morale, but his heart sank to the bottom.

Even a Pillar-level swordsman would be overwhelmed by the combined attack of six Lower Moons.

One team member had his abdomen ripped open by the demon's claws, his intestines spilling out onto the ground; another team member's head was twisted off, his headless corpse still in a fighting stance.

Just as the Demon Slayer Corps was suffering repeated defeats, a series of orderly footsteps and the clanging of metal suddenly rang out in the mountains and forests.

"what is that?"

One of the Lower Moon demons turned around alertly.

The next moment, dozens of specially made ultraviolet flares roared into the sky, their blinding white light illuminating the entire mountain forest as if it were daytime.

The ghosts let out mournful howls, their exposed skin began to smoke and crack, emitting a burnt smell.

"The Sakura Self-Defense Force Special Operations Unit is ordered to support the Demon Slayer Corps!"

A majestic voice echoed through the valley via loudspeaker.

Immediately afterwards, soldiers dressed in special protective suits poured out from all directions, carrying weapons equipped with high-intensity ultraviolet lamps and specially made silver bullets, quickly forming a tight encirclement.

The soldiers' masks reflected a cold light, and the beams of their tactical flashlights intertwined to form a web of death.

"Chaebol Joint Security Forces in position, commence purification operation!"

Another, better-equipped private armed force also joined the battle.

They brought with them a newly developed wisteria flower concentrated poison mist launcher. The pale purple mist quickly spread, withering vegetation wherever it went, and was especially deadly to ghosts.

The Lower Moon demons clearly hadn't anticipated this turn of events.

"Retreat 1 slip 1x Ni IV Wu Jiu IV (nine) 玐峮O}!"

Nightmare gave the order through gritted teeth, but it was already too late.

Kyojuro Rengoku seized the opportunity, unleashing the blazing flames of his Flame Breathing Ninth Form, Rengoku, like a volcanic eruption, severing the neck of a Lower Moon.

Sanemi Shinazugawa, in coordination with the Self-Defense Forces' firepower suppression, unleashed a tornado of sword energy from the Seventh Form of Wind Breathing: Gale Tengu Wind, forcing Lower Moon Five into a desperate situation.

As dawn broke in the east, the fierce battle finally came to an end.

The six Lower Moon demons and the demons they brought were completely wiped out, but the Demon Slayer Corps also paid a heavy price.

Five team members will be laid to rest here forever, while three others were critically injured and on the verge of death.

Kyojuro Rengoku knelt on one knee, his Nichirin Blade embedded in the soil, supporting his weary body. His haori was soaked in blood, indistinguishable between that of his enemy and his own.

"Thank you for your support."

After resting for a while, Rengoku Kyojuro bowed deeply to the Self-Defense Force commander, his voice hoarse.

"Without you, we might have been wiped out."

The commander removed his tactical helmet in return: "It was all thanks to Lord Genichi Hanyu's foresight in arranging for us to come and support you..."

……

Inside He Xi's research institute, He Xi was intently staring at Tong Mo's blood sample in a petri dish.

Her long, silver hair shimmered under the laboratory lights, and her slender fingers constantly adjusted the focus of the microscope.

"That's strange..."

She muttered to herself, her brow furrowed.

"Why is it so difficult to reverse engineer the human-transforming drug?"

As she moved her finger through the air, a holographic projection appeared, displaying a dazzling double helix structure of DNA and complex protein molecular models.

The laboratory door was pushed open, and Genichi Hanyu strode in.

"Six lower-ranking charioteers have been killed, and their blood samples have been sealed and sent over."

Without looking up, He Xi continued adjusting the instruments: "The genetic samples from the Lower Moon have limited use. I need more living samples from the Upper Moons, preferably cell tissue from Muzan Kibutsuji himself."

“I will try my best to obtain it, but I have already asked Kagaya Ubuyashiki to contact Tamayo. With her understanding of Muzan Kibutsuji’s cells, she should be able to provide you with some assistance.”

His gaze swept over the fluctuating data, which he couldn't understand at all. Fortunately, he had He Xi. Once the research was completed, it would greatly improve the government's progress in this world.

Conquering the world isn't that simple; you have to completely destroy the storyline of a world.

The plot of this world revolves around the battles between humans and demons.

What Genichi Hanyu has to do is to completely eliminate the demons!

Three days later, under tight security, Tamayo finally arrived at the hidden research institute.

The moment she stepped into the laboratory, an undisguised look of surprise flashed in the eyes of this elegant female ghost.

"These devices are completely ahead of their time."

Tamayo exclaimed in surprise after seeing the equipment in the research room.

Without further pleasantries, Tamayo immediately took off her outer robe and rolled up her sleeves: "I have been studying the cellular structure of Muzan Kibutsuji for four hundred years. This is all my research data."

She took out an exquisite wooden box, inside which were neatly arranged dozens of blood samples and thick research notes.

In the days that followed, the laboratory lights never went out.

Finally, a potion shimmering with a pale blue light was created in the test tube.

When Tamayo carefully lifted the test tube, her hand trembled slightly: "It's a success. The potion that turns demons back into humans."

At the request of Genichi Hanyu, this drug was designed to be transmitted through the air.

Once the container breaks, the nanoscale viral vectors inside will spread rapidly, infecting all the monsters that come into contact with it, just like the T-virus in Resident Evil.

However, test results show that this version is currently only effective against demons below the Twelve Demon Moons. Upper Moon demons and Muzan Kibutsuji have too strong cellular resistance, requiring a higher concentration of the drug to be effective.

But that's enough.

The Curse of the 77 Ubuyashiki Clan

"If this potion is broken, all the demons except Muzan Kibutsuji and the Twelve Kizuki will turn back into humans?"

Kagaya Ubuyashiki's voice was exceptionally clear in the quiet Japanese-style room, and his originally pale face flushed an unnatural red with excitement.

Those eyes, which had become increasingly blurred due to illness, now shone with an unusually bright light, as if they could see right through Genichi Hanyu.

His fingers unconsciously gripped the clothes on his legs, his knuckles turning white from the excessive force.

Cold sweat trickled down his thin cheeks from his forehead, but he was completely unaware of it.

This sudden hope pierced through the calm that had been maintained for many years like a sharp sword.

As the leader of the Demon Slayer Corps, he was used to finding a glimmer of light in despair, but what Genichi Hanyu brought at this moment was not a glimmer of light, but a dawn that was enough to illuminate the entire night.

The long-cherished wish that the Demon Slayer Corps had failed to achieve even after four hundred years was now being presented to them with such casual ease.

Kagaya Ubuyashiki's breathing became rapid, his chest heaving violently, as if he were about to release all the expectations he had suppressed over the years.

He thought of the swordsmen who fell before dawn, of the mission passed down through generations of the Ubuyashiki family, and of his own body, which had been weakening for 27 days.

"Calm down, I know you're in a hurry, but don't rush."

Genichi Hanyu's voice remained calm and still as he tapped his long fingers lightly on the coffee table, producing a rhythmic sound.

This seemingly casual action contained a certain rhythm that gradually calmed Ubuyashiki Kagaya's restless mind.

After Kagaya Ubuyashiki calmed down, Genichi Hanyu finally spoke.

Genichi Hanyu's voice was deep yet carried a hint of casualness: "Muzan Kibutsuji is already quite timid. If we were to turn all the demons back into humans now, and Muzan Kibutsuji were to simply bury himself somewhere, where would we find him?"

Kagaya Ubuyashiki slowly exhaled, unable to remain calm even when faced with an opportunity to eliminate all demons.

But his years of leadership experience quickly brought him back to his senses.

Kagaya Ubuyashiki closed his eyes, weighing the pros and cons in his mind.

When he opened his eyes again, he had regained his composure and rationality.

Kagaya Ubuyashiki also understood that what Genichi Hanyu said was true. Compared to those little devils, only by eliminating the Demon King Muzan Kibutsuji could the problem of demons be truly solved at its root.

The Ubuyashiki family only truly understood this principle after hundreds of years of blood and tears.

For hundreds of years, the Ubuyashiki family has proven with countless lives that no matter how many demons are slain, as long as Muzan Kibutsuji still has a breath left, a new tragedy will be repeated under the moonlight.

Those ancestors who died before reaching adulthood are silently proclaiming this truth.

"Then I wonder what your plans are, Mr. Yuzuru. If you need my cooperation, I will do my best to cooperate, even at the cost of my life."

Kagaya Ubuyashiki's voice was firm and powerful, not at all like someone suffering from a serious illness.

He stared directly at Genichi Hanyu with his almost completely blind eyes, without flinching.

As long as Muzan Kibutsuji can be eliminated, even if Kagaya Ubuyashiki has to die, Kagaya Ubuyashiki will calmly accept his fate.

This is an innate awareness of the Ubuyashiki family.

Anyway, he doesn't have much time left to live. If he can kill Muzan Kibutsuji with his remaining life, then he can die with a smile on his face.

When the thought flashed through his mind, he even felt a sense of relief.

The heavy burden that has weighed on my heart for so many years may finally have a chance to be lifted.

Genichi Hanyu placed the teacup in his hand: "Have some tea, you've been coughing up blood."

As Genichi Hanyu spoke, Kagaya Ubuyashiki realized that he did indeed taste blood in his throat.