Thanks for the invitation. I'm in Type-Moon, inheriting the legacy of Zi-O.

"Outnumbered and outmatched..." Even Shakespeare lost his comedic flair, stroking his beard and turning the pages of his book with a hint of unease. "This current situation is precisely what is called a just war, however—"

The quill pen in his hand suddenly turned into blue magical particles and disappeared, while he scratched his head in frustration.

"I must admit, the number of enemies last time was simply too great... My magic power is about to be exhausted." Then, he shrugged, and even his figure became somewhat illusory. "Ah, no, actually it's already exhausted."

"What—?" Mordred, who was standing at the front, turned her head. Even her own arms were trembling. It seemed that she had reached her limit.

Then they saw... a large number of enemies surge in again from around that corner.

Without giving them any time to catch their breath, the enemy, filling their entire field of vision, charged straight towards them.

The only saving grace... is that there were no Chaos Mechs among the enemy horde this time.

Even so, the group, now depleted of magic, couldn't even lift their swords, let alone fight.

—But that only applies to Servants who use magic in combat.

“…Phew.” Raising his head, Nian Zhuo let out a long sigh and reinstalled the Decade watch face onto his driver. In contrast, he put the Gaim watch face back and took out a white watch face mixed with some blue and red.

—Build bubble shape.

"Decade——!" "Build——!"

"All of you, step back!" After pulling Mordred behind him, Nianzhuo stood at the front, looking at the oncoming automatons, artificial life forms... and those book-like enemies.

"Alright, let's begin the experiment." As he spoke, Nian Zhuo flipped the driver at his waist.

Accompanied by the hum of machinery, multiple cards reflected Nian Zhuo's body, imprinting him with magenta patterns.

Then, many bubbles suddenly appeared out of thin air, engulfing Nian Zhuo's figure... but one could vaguely see blue and red armor climbing up Nian Zhuo's body.

In the very end, a wisp of man-eating black energy brought everything to a close, shattering the bubble and revealing Nian Zhuo's true form.

Kamen Rider Zio'Decade Armor Build Hazard Form.

Its entire body was jet black, yet it was adorned with magenta patterns, while the eye armor was replaced with red and blue, exuding a chilling, ominous aura of black.

"Ugh... Nianzhuo, what are you trying to do!" Feeling her strength recover a bit, Mordred stood up, leaning on her sword, and looked at Nianzhuo in front of her. "Hey, you don't mean to go face those monsters alone, do you?" Out of the corner of her eye, she glanced at the monsters charging towards her. "No, you absolutely can't do it! Those monsters don't feel pain, and your condition isn't exactly good either!"

She spoke anxiously, but still couldn't muster any strength. Mordred could only stare at Nianzhuo with her emerald green eyes.

“Mr. Nianzhuo… I can too—” Mashu wanted to say something more, but Nianzhuo raised his hand to stop her.

"Trust me." He only said four words, but they seemed to have some mysterious magic, leaving Ritsuka and Mashu frozen in place.

Orange light appeared simultaneously in both his left and right hands, and Nian Zhuo spoke without turning his head.

“Mash, you don’t have any large-scale destructive means, and Mordred, in your current state, unleashing your Noble Phantasm’s true name is tantamount to suicide.” One or two small… gun-like objects were held in Nian Zhuo’s hands.

"So now, only I, and only I, can do it." The chilling black aura instantly surged outwards.

"Ugh—!" Startled by the black aura, Mordred and Mash couldn't hide their exhaustion and sat down on the ground for the time being.

However, Mordred's eyes still held dissatisfaction as she glared at Nianzhuo, who was standing at the very front.

Nian Zhuo had no intention of explaining to her at the moment; his mind was completely absorbed in the two pistols in his hands.

—Flying Eagle Gatling Gun x2.

I originally just wanted to give it a try, but I never expected that this kind of weaponry would actually appear as part of the Danger Rabbit Tank's arsenal...

"Rest well, you three girls." Nian Zhuo held up two Flying Eagle Gatling guns with both hands, a carefree smile on his face. "After all, you can't participate in my battle right now."

Multiple gun barrels were pointed at the oncoming monster. Nian Zhuo grinned maliciously and pulled the trigger—

Buzzing—as if activated, the reels of the Flying Eagle Gatling guns in Nian Zhuo's hands spun, gradually flashing with light.

“10（Ten）/20（Twenty）/30（Thirty）/40（Forty）/50（Fifty）/60（Sixty）/70（Seventy）/80（Eighty）/90（Ninety）！”

"100 (One Hundred)! Full Bullet!" A crisp click signaled that Nian Zhuo's two guns were fully loaded.

"—After all, this is absolute suppression of firepower!" Finally, Nian Zhuo flipped the driver at his waist three times, and multiple card lights appeared in front of him.

He pulled the trigger, and the cylinder on the gun began to spin.

"Vortex Break—!"

Bullets rained down, transforming into countless points of light that pierced straight through the card and struck the oncoming enemies.

Moreover, with the amplification of the cards, they can even be launched onto walls to make simple jumps... commonly known as ricochets.

Many bullets tore the leading magic book to shreds, and then continued to fire at the artificial lifeforms behind it, smashing their heavy bodies to pieces.

Each Gatling gun contained one hundred bullets, and now, with Nian Zhuo pulling the trigger, they poured out, each bullet bouncing off the surrounding walls and exiting the enemy's body twice.

In an instant, the entire corridor was transformed into a dense hail of bullets, leaving only the enemy, whose body was pierced, struggling to survive amidst the barrage.

After tearing all the attacking demonic books into fragments scattered across the ground, Nian Zhuo's bullets were completely exhausted.

However... some of the enemy still survived.

Around the bullet-pierced body of the artificial life form, something was constantly wriggling, repairing its wounds.

Although book-type enemies have disappeared, many automatons and artificial life forms have survived.

It would take some time to reload the gun in his hand. Nian Zhuo looked at the enemy who was about to pounce on him, and a slight look of surprise appeared on his face hidden under the mask.

It wasn't because of an enemy attack, but because an unbelievable figure appeared in front of him.

“You…” This time, even Nian Zhuo could hardly believe it, looking at the familiar figure in front of him, panting heavily.

A few minutes earlier, Jekyll, still a little uneasy, peeked out from the inner room during a break.

Immediately afterwards, he saw a dizzying sight: a pitch-black 'knight' was moving his body, his hands holding weapons that looked like guns, unleashing a dense barrage of bullets.

But it's obvious to anyone with eyes that... even under such an attack, some enemies will survive, and clearly, those of us who are exhausted in both physical and magical energy cannot do that...

"Oh dear, there's no other way!" With that, Jekyll suddenly stood up, put the magic book aside, and said, "I... I really wanted to avoid doing this!" He tossed the book to Andersen, and Jekyll could no longer contain his fervor and ran out.

"—Huh?!" Mordred was taken aback by the other person's words at first, and then she saw Jekyll drop his books and run out. "Hey, Jekyll, why are you running into the hallway without permission?" Mordred waved her hand and urged him, pointing to the room inside.

"What use is a half-baked magician! Get back to the library!" Although the words weren't exactly polite, the underlying message was that he was concerned about Jekyll.

"I told you before, I have a trump card." Jekyll pushed up his glasses and looked calmly at Mordred, then at everyone's faces.

Suddenly, Jekyll pulled a small box from his pocket. When he opened it... Ritsuka only had a syringe that looked like a needle.

“…Fou?” Fou tilted her head curiously, looking at the syringe-like thing in Jekyll’s hand.

"This is the elixir, and it's specially made." Waving it towards Ritsuka and the others, Jekyll inserted the needle of the syringe into a vein. "And... it's specially made. Inject this medicine... like this... into the body..."

The liquid in the syringe gradually dwindled, and a strange ripple began to appear on Jekyll's body.

Nian Zhuo naturally noticed the strange phenomenon, but the gun in his hand was still spitting fire, so he had no choice but to suppress his doubts.

"W-what's going on?!" Suddenly, Mary's panicked voice came through the communication device, "A strange magical reaction has suddenly appeared over there?!"

*Pfft*—Suddenly, Jekyll clutched his abdomen, where a little blood was seeping out. With what little reason he had left, Jekyll slowly walked towards Nianzhuo, taking off his glasses at the same time.

Gradually, Jekyll's hair became wild and interesting, and his eyes changed from emerald green to red. Regardless of these changes, 'Jekyll' moved his body with a joyful smile on his face.

"Ha ha—" With fangs like a wild beast, 'Jekyll' excitedly opened his arms.

"Hehehe, hahahahahahaha!" He covered his face and laughed wildly, but the fervor in his eyes said it all: "It's been so long since I've shown up! I'm here to make my grand entrance!"

"Fou...Fou...! Chirp!" Fou shook her ears vigorously, as if she couldn't believe that the rude man in front of her was the gentle and refined Jekyll.

"Huh?!" Mordred was even more incredulous, looking the suddenly appearing red-eyed man up and down, before finally shaking his head in dejection.

Dangerous Game (a game of crime)

Both Ritsuka and Mashu were slightly stunned as they stared at the man standing there, seemingly in a frenzy.

"...???" Mash looked at Ritsuka with a question mark in her eyes and an uncertain look.

"Who...who is this?!" Ritsuka instantly hid behind Mash, peeking out with a frightened expression. "He is...Jekyll?"

“Yes, it’s Mr. Jekyll… Henry Jekyll!” Although it was hard to believe, the other person’s attire was unmistakably Jekyll’s, but even so, Mashu still murmured in surprise, “But this situation is just like in the novels, completely different…”

"Just like in the novel...?" Nian Zhuo raised an eyebrow, looking at 'Jegil' who was laughing maniacally. "So, who exactly are you...?"

"Hahahaha! Hahahaha! I am Hyde!" The man named Hyde dipped his hand in the blood from his abdomen, licked the crimson stain, and then laughed even more wildly, "I will kill all those who annoy me! Those who get in my way! Kill! Kill! Kill!"

Then, his body slumped down like a cheetah, his scarlet eyes fixed on the remaining enemies before him, his transformed hands looking somewhat terrifying in the torchlight.

"Hahahahahaha!" Hyde burst into maniacal laughter, then lunged forward, swinging his fist at the foremost artificial lifeform. "Kill them all! Kill them all! Whether they're artificial lifeforms or Chaos Machine Soldiers—!!"

With a single punch, the writhing artificial life form was blasted into white dust by Jekyll's fist...

"!?!" Everyone watching Hyde's actions from behind was taken aback.

Although Jekyll claims to be human... his ability to move freely through the demonic mist and the feeling he evokes in Nenju... undoubtedly make him a Servant.

But only now has the man named Hyde brought a little tension to Nian Zhuo.

“…This ability should have improved his physical stats.” Nian Zhuo put away his dual pistols and didn’t follow. “However…personality switching…this enhancement should be at the level of an ordinary [Three Knights].

Not only that, after shattering the human's life form with a single punch, Hyde then dashed towards another monster at a speed that was not at all human-like, and his fighting style... was like that of a Berserker who had lost his mind.

Finally, the main event arrived—a dull mechanical hum came from the street corner, and a chaotic mechanical soldier appeared there.

"...! Hahahaha!" Quickly sensing the appearance of the Chaos Machine Soldiers, Hyde laughed as if he had finally met an enemy that excited him. He threw another punch, smashing the automatons in front of him into pieces.

He paused for a moment, then ran towards the Chaos Mechanical Soldier, raising his leg to sweep it directly at the opponent's head.

Clang—the sound of metal scraping rang out as the Chaos Mech raised its arm to block Hyde's attack, but cracks appeared on the iron armor of its arm the next moment.

"That's it! That's it! Hahahaha!" Even though his attack was blocked, Hyde still laughed wildly and swung his fist at the Chaos Machine Soldier.

It's hard to imagine... With just his physical body, every punch Hyde threw left a mark on the Chaos Mech Soldier. Under his continuous attacks, the Chaos Mech Soldier's metal armor was covered with spiderweb-like cracks.

"...Oh, he charged at the enemy." Mordred could finally sit down with some relief, panting as he watched Hyde locked in combat with the cyborgs. "He's practically a Berserker, pretty capable, huh?"

"I see... so the elixir caused a drastic change in his personality." Sure enough, Mary had also seen through Jekyll's trump card, raising an eyebrow with some concern. "I knew it! He's still Jekyll... and Hyde!"

A novel—Dr. Jekyll and Mr. Hyde—had appeared in her hand without her noticing.

Edward Hyde, also known as Mr. Hyde, is the protagonist of the novel "Dr. Jekyll and Mr. Hyde" by British novelist Robert Louis Stevenson.

Henry Jekyll drank an experimental potion that transformed him into the evil Mr. Hyde at night, committing all sorts of misdeeds. He constantly wavered between good and evil, tormented by the conflict between his spiritual guilt and the pleasure of crime.

She had this suspicion during her previous conversation with Mashu, and it has only now been confirmed.

Seeing the two different reactions on the screen, yet both belonging to the same point of light, Mary pinched her temples.

“But with such a drastic change in form, it should be putting a huge strain on his body!” Gritting her teeth, Mary connected with Andersen on the other end of the communication channel. “Hey! Andersen! Jekyll outside can’t maintain this form for long. By the time the enemy realizes what’s happening, Nian Zhuo will be the only fighting force left! Hurry up and finish reading the data!”