I adopted a child demon from the Gap, and I'm a special agent for the Bureau of Supernatural Ab

“Thank you for the information, Mr. 03,” Kiritsugu Emiya said calmly, stepping forward and patting Li Cheng on the shoulder to signal him to move aside. He then stood in front of the man. “However, I cannot verify the authenticity of your information. You have fought against us before, and we cannot fully trust you. Now, you need to give us a reason to believe you.”

"..."

After a moment of silence, the man raised his head, his gaze meeting Kiritsugu Emiya's. Kiritsugu looked at him expressionlessly, and the two stared at each other for a long time before the man sighed and lowered his head again.

"04 and I are both orphans, and we call each other brother and sister, relying on each other for survival. It was that man who turned us into his test subjects, test subjects for humans to undergo modification and merge with the power of ancient vampires."

A strange smile appeared on the man's gaunt face as he grinned.

"I am just a failure, completely inadequate in terms of strength, barely mastering some necromancy and sorcery. However, I have managed to barely reach the threshold of A-rank. But my sister, 04, was used by that beast in an even more cruel experiment."

Suddenly, the man turned his head and looked at Li Cheng.

“You’ve seen her, haven’t you? You’ve seen that monster, that monster covered in pus and with deformed limbs. You must have seen her, your aura doesn’t lie to me,” the man’s face twisted, his withered cheeks almost cracking open, “She’s my sister, my sister!”

In his memory, the image of that eerie monster that attacked at midnight, howling in pain and calling out "brother" came back to Li Cheng's mind.

So, that strange...she was calling out to this person?

Then, Rin Tohsaka arrived and used a self-binding spell* to force the man to be unable to lie. After more than an hour of discussion, everyone present finally understood the general situation.

The man designated A-03 and his sister designated A-04 were both test subjects from a mysterious experiment. Their original memories were erased, and they even completely forgot their own names. However, the two children, who were once children, always relied on each other and never lost their bond.

However, as the experiment officially began, the boy transformed into a sorcerer resembling several corpses, while the girl was directly twisted into a terrifying monster. Unable to progress further, the boy, as a failed experiment, was treated as a expendable resource, randomly dispatched to various missions, many of which were dangerous enough to easily kill him. But he tenaciously survived, all for the sake of reuniting with his sister 04.

At first, she retained her human will; although her body was constantly deformed and suffering, her spirit remained human. They occasionally had the opportunity to meet within the testing grounds. However, soon, as the experiments progressed, she completely transformed into a monster, a beast devoid of all humanity, even capable of devouring human limbs.

"But even in that state, she can still recognize me, she still won't hurt me, she'll be close to me, she'll lean on me like before, and she'll still call me 'brother.' She hasn't changed, she hasn't changed..."

The man spoke softly, his face gentle, as if recalling a beautiful dream, genuinely feeling joy and happiness. But soon, his expression twisted again.

"That's why I can never forgive that man, Carter, that bastard! He destroyed 04! He turned 04 into a monster!"

The chains tore at his skin, leaving a bloody wound, but the man was oblivious, only roaring angrily as if he wanted to tear his own face apart.

“His magic circuits have been destroyed by the Origin Bullet, making it impossible for him to resist the forced incantation. There are no traces of any runes or magic formulas left on his body,” Rin Tohsaka said after a careful examination, standing up from beside the man and nodding to Kiritsugu Emiya. “No problem, Vice-Captain. Everything he said, about that address and those things, is true.”

"……it is good."

After a long silence, Kiritsugu Emiya stood up, his previous calm expression vanishing, replaced by a chilling and murderous aura.

"Now that we have the enemy's exact location, it is enough to change the current situation of being on the defensive."

He pulled a cigarette from his pocket, lit it, took a deep drag, and spoke in an extremely serious tone:

"Notify everyone, the time to retaliate has come!"

…………

Thank you to reader 丿布吟桑? for the razor blade, thank you so much!

Thank you to readers 丿布吟桑?, 无氟变频, and 绮罗星 for their monthly tickets.

Thank you to readers Wucibianfeng, Da Tuzi, Hanyu Ringo, Kanata no Gensokyo, and 丿布吟桑 for their recommendation votes.

Book recommendation: *Illya, the Unyielding Warrior*, by Undertale

The book title sounds very impressive, and the content seems quite good too. Interested readers can check it out.

Even if I, Illya, only had a year left to live, and was stabbed in the heart by Gilgamesh and buried in the black mud, I would never participate in the Holy Grail War!

—Saber is so pretty, hehehehe.

------

"Come out, my servant Hercules, and let me see your eight-pack abs!"

"There's no such thing..."

Why did I summon a dark-skinned loli?!

------

"Humans have limits, and I have come to realize this in my short life."

"What are you talking about, Ilya!?"

"I'm really not your daughter, Chess!!"

------

"The oldest hedgehog-headed human, don't think you're the only one who can summon weapons, come out! [Brothel Tactical Doll]...Where are you!?"

"Excuse me, we'll touch it first."

"No! I'll never give out random names again!!"

------

In short, this is a hilarious story about a tough guy who inexplicably becomes Illya and suffers setbacks in the Fate world.

Section 164, Chapter 23: Preparations and Advances Before Battle

"Li Cheng, and the team leader, you two are best suited for frontal assaults. This time, the breakthrough operation will be entrusted to the two of you to launch a frontal attack. Any questions?"

"Leave it to me." "Okay."

“Wu Ming, your injuries haven’t fully healed, so you’re not suited for high-intensity combat. You’ll be in my group this time, and we’ll be responsible for long-range support. You can act as a support personnel and rush in at critical moments.”

"it is good."

"Tohsaka, as usual, you'll be in charge of support during the operation. The enemy is very strong this time, so don't be stingy with your gems. We can find a way to get compensation from headquarters later."

"Huh, really? Then they probably won't notice even if I quote three times the price—cough, what are you looking at? I was just saying. Do I look like that kind of greedy person?"

"So, Xin, you excel at solo operations. This time, you'll separate from them and infiltrate their testing ground alone. The objective is to assassinate a powerful enemy and search for any potentially important information. Therefore, your mission is the most demanding and dangerous. Is that alright?"

"Absolutely, we will not fail in our mission!"

Standing in the conference room, a city map was projected onto the table, and the mission was explained to each member of Group Six. Kiritsugu Emiya slung his usual sniper rifle over his shoulder, tucked a high-powered pistol modified by magic into his pocket, and made his final preparations for the counterattack.

"Um, Emiya-senpai, what should I do?"

Sitting in the corner of the conference room, Touma Kamijou raised his hand, scratched his face somewhat embarrassedly, and asked in a low voice.

"Kamijou, you'll be in charge of staying at the sixth group's branch."

Without even looking up, Kiritsugu Emiya made his decision without the slightest hesitation.

"Huh? Should I stay here?"

Touma Kamijou looked surprised, clearly not expecting that so many people had been given seats, yet he had been left out. It felt as if he was being looked down upon for his fighting ability.

“In any case, our base still needs to be guarded, and,” Kiritsugu Emiya said, pointing to the man 03 who was sitting in the corner of the conference room, the one who had given them the information, “his magical circuits were destroyed by my Mystic Code, and now he has lost the ability to protect himself and needs someone to protect him.”

Under Kiritsugu Emiya's unquestionable decision, Touma Kamijou ultimately stayed at the branch, responsible for protecting the men who had lost their fighting ability and contacting headquarters when necessary.

Meanwhile, the other members of the sixth group, carrying their necessary weapons and equipment, began their journey to the location indicated by the intelligence.

"Speaking of which, would the other side really send someone to the branch to kill that sorcerer again? I think it's completely unnecessary. Although Kamijou's physical abilities make it difficult for him to participate in A-rank battles, his abilities are still very effective against magicians and superhumans."

On his way to the target location, Li Cheng opened his communication device and asked somewhat uncertainly.

"Not necessarily. Based on that man's description of some situations in the laboratory, Carter should be a person with a strong desire for control. He probably wouldn't easily let an experimental subject be controlled by an outsider."

Kiritsugu Emiya's voice followed immediately through the communication.

"Huh, is that so?" Li Cheng was somewhat surprised; he hadn't considered this possibility at all. "But if that's the case, will Kamijou be alright on his own?"

None of the enemies that have appeared so far have been below Rank A; even the weakest, the defeated and captured sorcerer, possessed considerable strength. Given Aoyama's current strength, can he truly withstand enemies of that caliber?

"Emiya, if it's one of those enemy units we've faced attacking, Kamijou might have a hard time fighting them off, right? Are you sure this is a good idea?"

After thinking for a moment, Li Cheng still put forward his own idea.

"Don't worry, Jo. That kid Kamijou is much stronger than you think. It's just that he hasn't stood out much in the battles he's been through in the past."

Furthermore, even if he encountered an enemy he likely couldn't defeat, he wouldn't die so easily. His own abilities were one factor, but another was that someone wouldn't let him die so easily.

However, Kiritsugu Emiya did not mention this reason in the communication.

After all, this operation was itself a test. A test of what forces were hidden behind that child, and what their purpose was.

His thoughts gradually ceased. Kiritsugu Emiya turned off his communications and took out a sniper rifle from his bag to assemble it. He looked up from the top floor of the skyscraper, his gaze fixed on another building in the distance, the location indicated by the sorcerer's intelligence.

Beside Kiritsugu Emiya, Nameless, whose longbow had already been projected, stood at the edge of the building, also squinting as he observed the situation.

"Emiya, Wuming, take your positions."

At the same time, Li Cheng had already walked to a place not far from the building, under an overpass, and was standing in a bus stop, looking at the building where people were constantly going in and out.

Ryougi Shiki and Rin Tohsaka stood under a tree on the opposite side of the road, their gazes also fixed on the direction of the building.

"Li Cheng is in position."

"Tohsaka, take your positions."

"Okay, all set."

During the communication, the three people near the building spoke separately and began to slowly approach.

"Be careful. We don't know if the other side has any monitoring or observation methods that we are unaware of. Our own safety should be our top priority."

Kiritsugu Emiya spoke cautiously in the communication.

The three didn't answer, silently continuing towards the building. The bustling streets, the passing vehicles and pedestrians—this place seemed perfectly normal, not at all like a hidden laboratory or base. However, a vague sense of unease began to creep into Li Cheng's heart.

Is it because it's been too long since I've faced such a powerful opponent? I'm actually feeling this uncontrollable tension.

As Li Cheng walked towards the building, he pondered in his mind while calming his breathing, striving to be in the best possible condition.

But speaking of which, is Kamijou really alright? Although Emiya said there was no need to worry, he's only ever fought against B-rank enemies, and those were only pure magicians or espers, which is when he could usually unleash his full potential. Now that he's guarding the branch alone, if an enemy really comes knocking, can he handle it?

Li Cheng thought with some worry.

However, that's not necessarily true. Although Kamijou has always been unlucky, he hasn't encountered any truly life-threatening situations. Besides, the other party probably wouldn't do something like an attack during the day.

Thinking about it that way, Kamijou alone should be fine. After all, it's impossible for the other side to send an A-rank powerhouse to the branch in broad daylight.

As he pondered these matters, a sudden, intense sense of crisis washed over him, turning into a chilling cold that swept through his body. Almost instinctively, Li Cheng leaped forward, moving more than ten meters away. The next moment, a heavy thud came from behind him.

"Ughhhhhh—"

A familiar, piercing roar, overflowing with extreme pain. Li Cheng turned around and saw the enormous, deformed monster he had once fought, the ground cracked by its body, and several innocent cars passing by.