The world of Type-Moon starts with saving Altria!

"Anyway, we are now protected by the goddess Venus, so there shouldn't be any major problems."

"At worst... we'll just have to wait until she finds Ereshkigal, the goddess of the underworld here, and then we can take other actions."

"That's not the best approach either."

BB muttered quietly.

"They're not babies. Who knows if they'll abandon you at some point!"

"but--"

BB looked at the owner in front of him with some resentment.

"Even if BB asked you to leave, you definitely wouldn't leave now, right?"

"..."

"You still understand me, BB." Ian smiled.

"Oh, I'm really impressed by you." BB said helplessly, "From what you said, you must have encountered something again, right?"

"almost."

Ian looked at the scene in front of him and the dead tentacles all over the ground, his expression becoming quite complicated.

"BB, this is what's going on now."

A few minutes later.

"..."

"This……"

BB couldn't believe what he just heard from Ian.

"You mean, there's a Heian-kyo underground in Uruk?"

"Correct."

Ian nodded.

"It can't be said to be Heian-kyō, but at least its appearance seems to be consistent with that era."

"..."

Perhaps because he knew that Ian would never joke about such a thing, BB's expression became even more serious than before.

"Then things might be even more problematic."

"Pig, do you remember that Chaldea detected a massive underground energy source?"

"Correct."

"Based on what you just said, I think it might be Ereshkigal."

"Do not."

BB shook his head to deny Ian's idea.

"If that goddess of the underworld really existed, do you think she would replicate a country she didn't even know existed beneath Uruk?"

"There must be something that causes this phenomenon."

"Pig, you should be able to guess what BB means."

When the super AI girl said this, the man's mind was also opened.

"Copy something that doesn't exist into a real space."

"Wait a moment!"

Ian suddenly understood.

"It's 'projection'!"

"It's the same 'projection' as me!"

"It seems you understand."

BB gave him a look that was approving but also a little worried.

"Even though it's known it couldn't be Ereshkigal, a complete 'projection' of Heian-kyō would appear beneath Uruk."

"That means that powerful force may think this has some meaning."

"And—" the man continued what BB said.

"Ereshkigal is likely no match for the being capable of 'projection'. As a deity native to Uruk, she would most likely not allow anyone to do such a thing in her underworld."

"And this may also be the reason why the curse has not dissipated."

Everything seemed to fall into place.

But if possible, Ian didn't want to get such an outcome.

This means that the next action may be more difficult than imagined.

"Are you scared?"

BB's tone softened a bit.

She did enjoy playing pranks, but that didn't mean she couldn't understand Ian's feelings.

"How about we leave the underground first and wait until we have more data before exploring further?"

"No way."

Ian rejected BB's suggestion without hesitation.

"BB, now that we know there are beings capable of such feats, shouldn't we eradicate them as soon as possible?"

"After all, if the underground where Ereshkigal is located can be transformed into this state now, then who knows what it will become over time."

"..."

BB had nothing to say.

After all, she knew that both she and he were right.

Once they retreat, it becomes a "technological" competition between Chaldea and Uruk-the Chaldea will first understand the nature of "projection", or such a being will corrode this singularity first.

That kind of thing...

It’s hard to say who will benefit from it.

"By the way." Ian broke the silence between the two.

"Okita Souji showed up too, BB. What do you think of this as..."

"Eh?"

"A Servant?" BB looked surprised. "Did you come here because of the Holy Grail?"

"It's still uncertain at this point."

Ian recalled how Okita Souji fought.

“But I think it should be like that.”

"after all--"

"Her fighting ability is indeed not bad."

"Will this be part of the 'projection'?"

"That's unlikely," BB offered his own answer. "'Projection' is ultimately just a reproduction of a principle, but how can we, as humans, have principles?"

"But, since you said so."

"She should be on our side, right?"

"Ah."

Ian nodded.

"He is absolutely on our side. He can even be considered a Servant from Chaldea."

"That's good. If there's one more enemy—"

"Um?!"

BB suddenly realized something.

"You pig, judging by your tone, could it be that you have already..."

"No."

Ian shook his head.

"Absolutely not right now—we've only just met, haven't we?"

The man did not lie.

There really isn't one now.

But it’s hard to say what happened before and after.

"Too……"

"If something like that happens right from the start, the people around you will eat you up."

BB muttered a few words under his breath, and then brought the topic back on track.

"Then BB thinks that she might be the key to solving the problem—"

"How about listening to her more?"

"After all, since she appeared in the underground of Uruk together with Heian-kyo, BB thinks that her appearance itself symbolizes some kind of meaning, right?"

"I do think so—"

The man was about to say something more when he heard some footsteps from behind him.

Then, probably not wanting to eavesdrop on Ian's conversation, the owner of the footsteps quickly spoke.

"Sai San, can I come over here?"

The only one who would call himself that is Okita Souji.

The man turned around and found that it was true.

Dressed in a kendo uniform, she lowered her head slightly, looking a little embarrassed.

"I have something I want to ask you."

"..."

"Pig, take care of your business first. BB will catch up with you later."

The Super AI Girl very sensibly found a reason to end the conversation, leaving time for Ian and Souji Okita.

"..."

"what's up?"

Ian calmly put away the communicator.

"Okita, come over here and tell me."

"it is good."

Souji Okita nodded, and then came to Ian's side.

"By the way, who were you looking for just now——"

Perhaps realizing that he was crossing the line a bit, Okita Souji quickly added another sentence.

"I mean, if it's convenient, could you tell me?"

"If it's inconvenient, forget it."

"..."

The words had been said so tactfully, and after hesitating for a moment, Ian decided to tell some facts.

"Okita, you should know that something is wrong with this place, right?"

"Yes."