Chapter 71: Longevity Gene: Type IV

The human-form body dissipated, and Red Queen, who could not be observed by the naked eye, escaped in the form of a psionic lifeform.

"Bastard!!"

Shiki Ryougi was so angry she broke her defense. With her state fully opened and buffs stacked, the feeling of missing her target was extremely torturous.

"Friend, you’ve only grown this much in seven months; you’re too disappointing."

"Too weak. You’d better play with the twenty thousand cannon fodder. Bye-bye~"

Red Queen used "Infinite Castle: Heaven-Net" and, with the help of the mouths of the twenty thousand cannon fodder, mocked Shiki Ryougi with sarcastic remarks.

Shiki Ryougi’s forehead veins bulged with anger, and bloodshot eyes climbed onto her blue-purple magic eyes.

The enemy clearly looked like they had extraordinary strength, yet they chose a war of attrition with legions—truly despicable!

"Just you wait! I’ve remembered your face!"

"It’s best not to meet in the same instance in the future, otherwise I will search the heavens and the yellow springs to kill you!"

Little Red Queen, who was manipulating the legion battle, retorted with a poisonous tongue.

"Hey, how do I put this? Due to some compelling reasons, I only killed a tiny fraction of the 'compatriots' in your cognition…… yet you are stubbornly relentless."

"Friend, you may have lost your compatriots, but you still have me! I can completely be a friend on your life’s journey, just like how you get along with the Demon Slayer Corps."

"F*&!%#!"

Infuriating! Too infuriating!

Enough is enough; she had to explode with her today!

Unable to find Red Queen, she would vent her anger on the demon legion!

First break! Crouching Dragon emerges from the mountains!

Not long after, all the high-level cannon fodder Meng Yi had temporarily modified died under her butcher’s knife.

"Oh my, that’s terrible, friend. They are your compatriots; how could you be so cruel?"

Red Queen’s incessant verbal provocations came from the mouths of every demon, making it impossible to lock onto her true location.

Shiki Ryougi turned a deaf ear; hatred had eroded her soul, and she continued to slaughter the demons wearing exoskeleton armor.

Second break! Famous in one battle!

The beautiful white figure shuttled through the demon tide, like a scythe of death reaping life, and the demons fell in droves.

"Think about it, when demons become the mainstream and the Demon Slayer Corps becomes the anomaly, who is right? Who is wrong?"

Third consecutive! The world is shocked!

C-grade physique + "Mystic Eyes of Death Perception" + C-grade extraordinary magic blade; every blade light could reap dozens of demons.

Shiki Ryougi’s physical strength was more than half exhausted, and she had killed a quarter of the demons.

The heavy burden of the "Death Curse Body" + "Demon Slayer Mark," which significantly squeezed her body, almost made her unable to maintain the buff stacking state.

The other battle circles had already come to an end, and only Shiki Ryougi was still putting up a desperate resistance.

Demon Slayer Corps leader: Kiriya Ubuyashiki, a young child, crouched on the ground like a quail, trembling.

Amane Ubuyashiki kept comforting her crying daughters.

Tanjiro Kamado, Nezuko Kamado, Shinobu Kocho, Kanao Tsuyuri…… exhausted, they were tied up by the demon legion, their jaw joints removed to prevent suicide.

*'Hoo—hoo—'*

Beads of sweat trickled down Shiki Ryougi’s forehead. Her plain white kimono had long been soaked with blood and sweat. She glanced at the Demon Slayer Corps, which had lost 50% of its personnel but kept all key members alive, with the corner of her eye.

Her muddled mind couldn't understand Red Queen’s intention in doing this.

"Why not end the instance main quest?"

"Guess~" Red Queen was infuriatingly teasing, continuing to output.

Shiki Ryougi gritted her teeth and stopped looking at the Demon Slayer Corps.

The enemy had invaded in force, and she had already done her best to resist; the kindness of learning the Sun Breathing technique, Demon Slayer Mark, and Transparent World had been repaid.

The top priority was to prioritize her own safety.

*'"Extreme: Death Curse Body"!'*

C-grade physique → C-plus grade physique!

Dense, tadpole-like curse marks condensed into the pattern of a black spider lily, looking extremely evil.

Shiki Ryougi in her extreme state might be able to kill the remaining 150,000 demons, but she would inevitably die of exhaustion.

"Friend, are you going to run away? Are you not prepared to take revenge on me?"

"Today’s business is finished today. Tomorrow after tomorrow, how many tomorrows are there~"

"Get lost!!"

Since the start of the fight, Shiki Ryougi, who had broken her defense, was the first to retort to Red Queen head-on.

With a fierce stomp, the earth for several kilometers around trembled violently.

Dust rose, cracks spread, and Shiki Ryougi fled.

Watching the figure getting further and further away and disappearing at the end of her line of sight, Red Queen slowly outlined her silhouette.

"Friend, all of Fusang is my eye; you can't run away~"

To prevent Shiki Ryougi’s "brain thrombosis" from recovering and her returning to slaughter the Demon Slayer Corps, thereby ending the *Demon Slayer* instance, Red Queen ordered the six SSR: Wormhole technology-type demons, including Nakime, to open channels and teleport the remaining Demon Slayer Corps members to the Infinite Castle.

As for the small fry in the Swordsmith Village, clean them up.

After dealing with the main work, Red Queen manipulated the 150,000-strong demon legion to search the Swordsmith Village for valuable items.

Not long after, the Yoriichi Type Zero puppet, samples of Scarlet Sand and Scarlet Ore, and the Nichirin blade forging classics were all packed up.

The battle between the demon legion and the Swordsmith Village ended with a complete victory for the demon legion.

Everyone in the Demon Slayer Corps won a small room in the Infinite Castle.

Check-in, three meals free, and prevention of backstabbing from Shiki Ryougi and Flandre.

……

Tokyo Prefecture: City East District: Underground Infinite Castle.

"Director, Shiki Ryougi has 'successfully' escaped."

Little Red Queen, who was one step behind Meng Yi, waved her hand and summoned the 24-hour no-dead-angle surveillance screen of Shiki Ryougi.

The Japanese people, who had suffered nearly half casualties, were emaciated, and kept working for 18 hours, were shocking.

Shiki Ryougi wanted to awaken the will of her "compatriots."

But how could the Japanese people, who had long been scared out of their wits, heart-dead, and numb, seek death?

"Do you need to lock her in the experimental area and make her a specimen?"

"According to calculations, in an estimated 278 days, Shiki Ryougi has a 95.72% probability of following the clues to find the location of the Infinite Castle headquarters."

Meng Yi’s palm landed on Red Queen’s head, rubbing the black hair that was as smooth as silk.

"No need."

"Shiki Ryougi holds a grudge against Red Queen; what does it have to do with me, Meng Yi?"

"This instance is an enemy, and no one can say for sure what the future holds."

"Just like I’m thinking about the Three-Body worldview of Luo Ji’s hometown and the Tree and Sea worldview of Firefly’s hometown, the Type-Moon worldview of Shiki Ryougi’s hometown is also very valuable."

"Hehehe~"

Red Queen narrowed her eyes and smiled foolishly. She stood on tiptoe like a little pet, rubbing her head against Meng Yi’s broad palm.

"Yes! Then start the 'Misleading Plan' and delay time as much as possible."

"Lure Shiki Ryougi to the Hokkaido region and separate her from Flandre Scarlet in the southern Kyushu region."

Meng Yi nodded slightly. "Hmm, I’m going to the experimental area."

"Yes."

Little Red Queen patted her flat chest and promised confidently: "There won't be any trouble~"

Meng Yi’s eyelids twitched. Red Queen’s appearance like an old general on the stage always made him feel like she would overturn the car at any time.

"Be careful, don't lead the flames to the Tokyo Prefecture area."

"Yes!"

……

Infinite Castle: -2 Floor: Experimental Area.

Research must go from easy to difficult. Meng Yi collected the forging classics while parsing the molecular arrangement structure of the basic materials of Nichirin blades.

Scarlet Ore, main components: hematite, crystalline silicon……

Due to its special molecular arrangement order, this thing has the firmness of iron while also being considered a natural solar panel.

Through the solar thermal radiation energy stored during the day, it causes restraining damage to demons when fighting them in the wild.

"Barely acceptable."

Meng Yi was uninterested and casually stored the molecular structure of the Scarlet Ore into the "Big Data Library: Memory Palace" to enrich his foundation.

The puppet: Yoriichi Type Zero, forged by the Swordsmith Village imitating Yoriichi Tsugikuni.

A mundane technique-type imitation, it only imitated the "form" of Yoriichi Tsugikuni but lost his "spirit"—a small-fry item, very ordinary.

It was a harvest nonetheless; Meng Yi extracted and saved the idea of the biomimetic puppet.

……

Meng Yi paced to the test bench, where the unconscious Nezuko Kamado was placed.

"B-grade: Psionic Energy" and "Microscopic Domain Interference" were activated, and the Bai Xue instruments operated at full power, making every molecule of Nezuko Kamado clearly visible.

"Huh, interesting!" Meng Yi’s eyes lit up.

From the microscopic perspective, Nezuko Kamado’s gene chain presented a "Triple-Helix Möbius Strip" form similar to Muzan Kibutsuji’s, but there were differences in the details.

Nezuko Kamado’s third "Human-Demon: Gene Chain" was more complete than the Scum Demon King’s, but not as long as the "Human: Gene Chain" and "Demon: Gene Chain."

"The reason is 'not strong enough'!"

"It is precisely because it is 'not strong enough' that the 'Human-Demon: Gene Chain' can only play a role of suppression and central balance, and cannot destroy the basic balance of the 'Triple-Helix Möbius Strip'!"

Meng Yi raised his finger slightly, and thousands of nano-scale threads extended into Nezuko Kamado’s mind, reading her childhood memories.

Having lived in an environment where the Blue Spider Lily bloomed seasonally for a long time, Nezuko Kamado’s "Human: Gene Chain" was subtly influenced by the "Blue Spider Lily: Gene Chain," inherently possessing resistance to the "Demon: Gene Chain."

Note, it was Nezuko Kamado who first came into contact with the "Blue Spider Lily: Gene Chain" and then came into contact with the "Demon: Gene Chain"—the order cannot be messed up!

Three years ago, Muzan Kibutsuji polluted Nezuko Kamado.

This experimental subject fell into a long sleep state due to "gene disorder," adjusting herself by burning "trace amounts of World Origin."

She both got rid of the Scum Demon King’s demon blood control and slowly evolved toward the direction of a "perfect demon" to a certain extent.

Unfortunately, the "miracle favor" contained in Nezuko Kamado’s body was not enough, and there was still one last step that needed to be compensated.

"Wisteria?"

Meng Yi talked to himself. If his memory was correct, it was Tamayo who helped Nezuko Kamado complete the final transformation, leaping to become a "perfect demon" who was not afraid of sunlight.

"I understand the production process of the 'Complete Demon'."

"① First polluted by trace amounts of 'Blue Spider Lily: Gene Chain'; ② then polluted by 'Demon: Gene Chain'; ③ sleep transformation, 'Blue Spider Lily: Gene Chain' vs 'Demon: Gene Chain' confrontation; ④ 'Wisteria: Gene Chain' completion."

"The good medicine to cure demon disease: Blue Spider Lily; the fierce poison to kill demon disease: Wisteria—both are indispensable!"

"So, there have only been two cases of 'Complete Demons'!"

Meng Yi cleared his train of thought and decisively went to the warehouse to take "Lab Rat: Tanjiro Kamado."

Tanjiro Kamado was not polluted by the "Demon: Gene Chain," but he still had a "Blue Spider Lily: Gene Chain" in his body that looked like a "Human-Demon: Gene Chain" but was essentially different, only it wasn't as long and complete as Nezuko Kamado’s.

"Next, it’s very simple: repeat the experiment, adjust the ratio, and constantly try and fail."

The Kamado siblings needed to burn "trace amounts of World Origin" to promote their own perfect evolution.

Meng Yi, who possessed "Molecular-level precision: Microscopic Domain Interference," had to a certain extent gotten rid of his dependence on "World Origin Crystals," at least F, E, and D grades were meaningless.

If the current Meng Yi returned to the *Resident Evil* instance, he wouldn't need to waste "World Origin Crystals" at all and could hand-craft the "Longevity Gene: Type III: Virus Progenitor" himself.

……

The "small rooms" in the Infinite Castle had ready-made Demon Slayer Corps samples, no need to go outside to catch malnourished, dying "White Cards."

Notifying Red Queen to send Shinobu Kocho and Kanao Tsuyuri into the experimental area, Meng Yi explored the production plan of the "Complete Demon" on the two lab rats.

As soon as he checked, Meng Yi shook his head in disgust.

"The order is wrong; these two lab rats are soaked in Wisteria."

The start was not smooth.

The Demon Slayer Corps lab rats that were transported later all lost the possibility of being promoted to "Complete Demon" because they had been in contact with Wisteria for too long.

Of course, Meng Yi could also use "Microscopic Domain Interference" to wash away the "Wisteria: Gene Chain" contained in the Demon Slayer Corps lab rats.

It was too time-consuming; there were plenty of lab rats, why bother?

"Red Queen, catch a few 'White Cards' from the outside; I have a use for them."

"Yes."

……

Ten minutes later, hundreds of "White Cards" were sent into the experimental area on the -2 floor of the Infinite Castle.

There was nothing to say; a "Vegetative Impact" upon meeting crushed the minds of the lab rats.

Meng Yi began to manufacture the mysterious "Complete Demon" according to the process he had deduced.

One "White Card" after another was scrapped because the ratio was wrong.

26 days later, the first successful experimental subject was born, and the "Evolution Paradise" notification sound arrived as scheduled.

[Notification: Player 'White Demon' perfected the "Demon: Bloodline: Extraordinary Factor" evolutionary route, moderately changed the world pattern, obtained C-grade rating: 1 + 10,000 Paradise Coins.]

Meng Yi didn't ask or listen, continuing to bury his head in scientific research.

……

On the 307th day of descending into the *Demon Slayer* instance, he embedded the spatial demon’s ability into the cumbersome "Complete Demon" production process, simplifying it into a fool-proof injection-type potion.

"Let’s call it 'Longevity Gene: Type IV: Complete Demon'."

[Name: Longevity Gene: Type IV: Complete Demon

Creator: White Demon (Meng Yi)

Rating: C-grade: Bloodline Gene Enhancement Potion

Effect: ① Endless lifespan (can extend life by absorbing energy); ② D-grade physical strength; ③ Physical mutation; ④ Bloodline progenitor-level: pollution spreadability; ⑤ Customizable spatial ability (choose one from spatial gate, spatial teleportation, spatial opening).]

"Hmm? It actually has a C-grade? On the same level as 'Longevity Gene: Type III: Virus Progenitor'?"

"Did the theoretical endless lifespan and spatial ability increase the upper limit of this potion?"

The protagonist would not inject "Longevity Gene: Type IV: Complete Demon."

He wanted to develop the basic framework of the "Bai Xue Battle Body v2.0" based on "Longevity Gene: Type IV: Complete Demon" + "Shenhe Civilization Gene Engineering."

Children choose one from spatial gate, spatial teleportation, and spatial opening; adults, of course, want them all.

I asked in the reader group, and the fathers said 4,000 words per chapter is more appropriate.

2,000 words is too little, nothing to see.

8,000 words is too much, easy to get tired.

Finally settled on the 3,000~4,000 range.

……

It’s the beginning of the month, asking for monthly tickets~

Fathers, I want 1,000 monthly tickets this month; a box of tissues from the author welfare draw is also not bad.

Can the fathers who plan to raise the book give an automatic subscription? ^_^