My youth story, a crossover anime, turns out, is FGO!

The battle between Taigong Wang and Joan of Arc seemed to have reached a stalemate, with Joan of Arc unable to defeat Taigong Wang and Taigong Wang unable to kill Joan of Arc quickly.

But is this really the case?

Unbeknownst to her, Joan of Arc was led astray from the road, and now she was in a forest.

Taigong Wang brandished his long red whip, the elongated whip forming a cage around Joan of Arc, rendering her immobile for a moment.

“I’m sorry, Lady Joan of Arc.” Taigong Wang opened his eyes, his gaze sharp. “Why do you think I used magic to guide you here?”

Joan of Arc's purple pupils contracted—oh no!

The smell of gunpowder slowly spread through her nostrils, but unfortunately, for an old-fashioned woman from hundreds of years ago, and for a rural girl like Leticia who lacked worldly experience, Joan of Arc was unable to immediately recognize the danger.

Makoto Aoki pressed the button from the shadows.

"Booom—" The white light of the explosion engulfed everything around it, followed by a tremendous sound.

Taiko no Momochi did not let his guard down. He and Aoki Makoto both knew that this attack could not defeat Jeanne d'Arc. After all, she was a Heroic Spirit with EX Magic Resistance. Her so-called Noble Phantasm "My Lord is Here" was nothing more than converting her EX Magic Resistance.

It can be said that even if Joan of Arc had taken a direct hit from King Arthur's beam attack, as long as more than half of the seals had been broken, she might not have died.

However, EX's magic resistance cannot withstand physical damage, meaning that if the Holy Sword pierces Jeanne's soul core, she will die.

So, Makoto Aoki cheated.

He used a bomb.

That's right, ordinary bombs can't hurt Joan of Arc, but that might not be the case after Taiko-no-Wang's enchantment. It's more of a physical attack than a magical one, especially since Joan of Arc can't become a spirit.

She manifested in the body of a rural girl named Leticia, which prevented her from becoming a spirit and even made her need to sleep and eat.

In other words, even if Joan of Arc couldn't be killed in one blow, she would still be affected by the bomb.

This is enough.

As the smoke and dust from the explosion dissipated, a figure could be vaguely seen still standing in the same spot. Just as Makoto Aoki had predicted, it was almost impossible for a mere explosion to kill Jeanne d'Arc.

"—My lord is here!"

She even activated her Noble Phantasm to defend against Taigong Wang's attack, since the effects of magic can be defended against by Noble Phantasms.

However, Jeanne d'Arc's vigilance was currently focused on Taiko no Osamu, who had not yet pressed his advantage outside, and she was completely unaware of her surroundings. After all, as a Ruler, she had the privilege of being able to see through the Assassin's concealed aura, making her one of the least afraid of being ambushed.

But Joan of Arc didn't notice that a small communicator had fallen beside her along with the surrounding rubble, because she really didn't recognize it, and the communicator didn't have any magical fluctuations.

That's the fatal flaw.

Therefore, during the protection of her Noble Phantasm, when Jeanne's vigilance was at its lowest, the surprise attack began in secret.

"Gotcha?~"

Makoto Aoki's true ace, the manager of the Moon Holy Grail War, and the highest-ranking AI, BB has appeared.

……

BB was originally a superior AI assigned to manage the Master's health in Mooncell Automaton, but it went out of control due to a bug and became Cancer, which invaded the computer world. It is also a computer demon that dominates the other side of the moon and hinders the SE.RA.PH Holy Grail War.

In the regular storyline, the final boss is almost always this purple-haired girl from the Sakura series, and as an AI, she naturally has advantages that other Heroic Spirits do not possess.

She can be transferred to any electronic device because BB is essentially spiritual data within Mooncell Automaton.

This is also the biggest reason why Jeanne d'Arc, who has the ability to detect enemies over a wide area, did not find BB. BB did not even have a spirit origin reaction before appearing from the electronic device.

"BB—Channel~" Without any hesitation, BB immediately activated her Noble Phantasm, and the unknown cherry blossom pink color around her suddenly locked onto Jeanne d'Arc.

"That won't do, but please don't worry."

As she said this, BB suddenly transformed, her black cloak turning into a white nurse's uniform, revealing her beautiful figure.

"Leave it to BB!" She held up a huge syringe filled with suspiciously colorful drugs, then plunged the needle deep into Joan of Arc's heart, injecting the drugs.

"Hey~ How was the injection this time?"

After retrieving the syringe, BB shared the power she had absorbed with those around her; even Taigong Wang could feel her own magic.

"This, this is..." Joan of Arc clutched her chest in anguish, kneeling on the ground. Even so, she did not immediately lose consciousness.

"Moon Cancer? Special job? Why would it appear?" Jeanne was completely baffled.

"Hehe, this is BB's exclusive kiss with me. Although others joined later, BB is the master at manipulating the rules." BB's purple eyes turned crimson. "So, the old woman who upholds the rules, just obediently let BB play with you."

Joan of Arc wanted to say something, but the unknown drug BB had injected her with had completely shut down her consciousness. The blonde girl's eyes became lifeless, and she ceased all movement.

“That’s it, be my toy, BB.” BB was extremely proud.

"Don't waste any more time, quickly find a way to obtain the Greater Grail through Joan of Arc!"

Makoto Aoki emerged from his hiding place and revealed his true purpose.

If we're talking about which Servant understands the Holy Grail best, aside from Irisviel's Heavenly Grail, it would be BB. As the administrator of the Moon Holy Grail War, she once wielded the "Golden Grail" and manipulated that Holy Grail War with ease. As a rule-breaker, she is essentially a "bug" Servant, and she is the true nemesis of Ruler.

So take the "counter" rule in FGO with a grain of salt. As a Moon Cancer, BB is not actually countered by Ruler Jeanne d'Arc.

"How anxious you are, senior." BB revealed a wicked smile. "I'll just consider the rules of the Holy Grail War completely distorted by BB."

“It should be fine,” Aoki Makoto said with some unease. “By using the passage through which Jeanne returned to the Holy Grail, you, BB, can return to the Greater Grail. If we’re lucky, we should be able to completely control the Greater Grail.”

In the Holy Grail War, the Holy Grail is actually the key to everything. Just like Amakusa Shiro Tokisada decisively went after the Greater Grail, having the Greater Grail meant having almost endless magical power.

This inspiration came from the Third Holy Grail War. Back then, Angra Mainyu's return to the Holy Grail completely distorted the interior of the Greater Grail, turning it into a black mud.

If BB goes in, she should be able to fully utilize the rules of the Greater Grail, even control a portion of them, and might even be able to replace Jeanne as the Ruler.

Anyway, BB has actually served as a referee in the Holy Grail War before, but not in this one.

At that point, the referees will all be on Makoto Aoki's side, so how can anyone else win?

Of course, if Amakusa Shiro Tokisada goes through all sorts of hardships to obtain the Greater Grail, only to find that it contains not the Winter Maiden, but the demon BB, then things will get really interesting.

"correct."

Even though it was Makoto Aoki's disguise, he still didn't trust BB, and continued to instruct: "Whatever you do, don't change the nature of the magic in the Greater Grail, I don't want the black mud!"

Although there's a saying that being corrupted by evil is ten times stronger, who knows if other problems might arise with the alternate account?

"understood--"

The drawn-out tone showed absolutely no sincerity.