The person who sent the message was none other than Da Vinci.
As the only possibility for repairing the entire Chaldea, every word she said naturally carried weight.
But even so, the content of the message was too significant at this moment.
Spiritron Summoning System?
This was a term that would make any magus think of many things just by hearing it.
Even someone as experienced as Ian couldn't help but feel a similar stirring of emotions.
And his state was noticed by Olga Marie.
"W-what's wrong?" The silver-haired girl, nestled in his arms, asked with some concern.
"Why are you making that kind of face?"
"..." Realizing that this wasn't something worth hiding, Ian quickly told Olga Marie and Fujimaru Ritsuka about the message Da Vinci had sent.
And the two of them showed different reactions.
Olga Marie frowned tightly, seemingly recalling some past events.
Fujimaru Ritsuka, on the other hand, looked puzzled—she had never heard of such a thing.
"Spiritron Summoning System?" The red-haired girl scratched her cheek. "What's that?"
"..." When Fujimaru Ritsuka asked this, Ian realized that although he had many thoughts about the "Spiritron Summoning System," he didn't really know how to describe it.
Fortunately, there was Olga Marie, who knew Chaldea inside and out.
Seeing the silence of the other two, she immediately explained.
"This... is a legacy left behind by my father." Olga Marie said softly, her amber eyes looking a little sad.
"Father's... legacy?" Hearing this, Fujimaru Ritsuka immediately realized that she seemed to have asked a question she shouldn't have.
Mash had already told her that Olga Marie's father had passed away several years ago.
"I'm sorry, Director." Fujimaru Ritsuka apologized quickly, her brown eyes filled with regret.
"I... shouldn't have brought that up."
"It's nothing." Olga Marie showed a relieved smile.
"It's a fait accompli anyway... I'm not as fragile as you might think." Olga Marie said gently, her amber eyes looking at them.
"As long as it's not too much, you can mention my father as much as you want, I won't mind."
Knowing that Olga Marie was genuinely saying these words, Ian didn't think too much about it.
He directly asked the question in his heart:
"Then——"
"Director, what exactly is this 'Spiritron Summoning System'?"
"If you ask me that." Olga Marie pursed her lips and thought seriously.
"I don't know how to accurately give it an easy-to-understand definition."
"But——" The young Director raised her head and looked at the man she loved before her.
"It's because of that that Da Vinci was able to come to our Chaldea."
"What!" Olga Marie's explanation made Fujimaru Ritsuka immediately understand.
"Then does that mean this is a device for summoning Servants?!" Fujimaru Ritsuka exclaimed, her brown eyes widening in surprise.
"You could say that." Olga Marie's gaze shifted to Fujimaru Ritsuka beside her. "At least in my eyes, they are equivalent."
"Wow——!" Fujimaru Ritsuka showed a surprised expression.
"Director, your father was amazing!" Fujimaru Ritsuka said admiringly, her brown eyes sparkling.
"To actually be able to create something like this!"
"W-well, of course!" As soon as her father was praised, Olga Marie immediately changed her demeanor.
"My father was very amazing!"
Completely different from the reactions of the two girls, after hearing Olga Marie's description of the "Spiritron Summoning System," Ian's mind thought of something else.
"Then Director——"
"Can I ask you a question?" Ian asked, his blue eyes looking at her.
"What question?" Olga Marie turned her head.
"Since this is a system for summoning Servants... doesn't that mean it's essentially the same as a summoning circle?"
"..." The Director restrained her excitement and nodded seriously and responsibly.
"If you put it that way, then yes, it is." Olga Marie confirmed.
"Then in that case——" Ian pressed on. "Can it search for specific targets?"
"I don't know." Olga Marie shook her head very honestly.
She was no longer as concerned about saving face as she used to be—at least not in front of Ian.
"After all, Da Vinci came here before I took office... as for whether she was specifically searched for by the 'Spiritron Summoning System,' I'm not sure."
"What's wrong?" Olga Marie tugged at Ian's clothes.
"Is there a specific Servant you really want to meet?" Olga Marie asked, her amber eyes looking at him with curiosity.
"..." Ian was stunned for a moment, then shook his head with a smile.
"No." Ian replied calmly.
"I was just asking casually."
"But Director, I think we should go see Da Vinci now, don't you think?" Ian suggested.
"Yeah." Olga Marie nodded.
"I think so too."
"Then——" Fujimaru Ritsuka took Olga Marie's hand, looking like she already regarded her as a good friend rather than a rival in love.
"Let's go quickly!"
"...Okay." Olga Marie found that she wasn't as resistant to sharing Ian with others as she had imagined.
After all, he did deserve to be liked by more people.
More than ten minutes later.
Following the location Da Vinci had given in the message, the group arrived in a large hall.
Different from the previous individual rooms, the hall the three of them arrived at had clearly been affected by the explosion.
There were extremely obvious repair marks on the ground, and a "cleaned" sign hung directly on the wall.
In the very center of the hall, a brilliant blue spherical object was slowly rotating, occasionally emitting scattered light, looking quite mysterious.
Da Vinci was standing right below it.
"Da Vinci." Olga Marie was the first to wave and speak. "We're here."
"Oh——?" Hearing the familiar voice, the rather elegant Da Vinci turned around and then tilted her head slightly.
"Eh?" Da Vinci said with a hint of surprise.
"Little Director, and little Ritsuka, what are you two doing here?"
"I... clearly only sent a message to Ian, right?"
"Eh... this!" In order not to cause trouble for Ian and to maintain the stability of Chaldea, Olga Marie had never revealed her relationship with Ian to others.
And when they were outside, she wouldn't deliberately cling to that man.
Just as Fujimaru Ritsuka had described before—this was a completely "underground romance"!
She didn't need him to take responsibility for her, even if they had unprotected sex.
But he had to be responsible for Chaldea.
Of course, Ian's behavior had shown that this man wasn't the type to deny knowing someone after sleeping with them.
So when Da Vinci asked this, she really didn't know how to answer.
Fortunately, Ian quickly noticed this.
As a substitute, he answered Da Vinci's question.
"Well... I was the one who proactively contacted them." Ian explained calmly.
"Da Vinci, one of them is the Director of Chaldea, and the other is a Master just like me. Wouldn't it be perfect for them to discuss this kind of thing?"
"I told you to call me Da Vinci-chan!" Da Vinci said with some dissatisfaction.
"But you're right, it was my oversight."
"Haa..." Hearing Da Vinci's answer, Olga Marie finally breathed a sigh of relief.
And her mind gradually returned to normal thinking ability.
"Da Vinci-chan." The Director paid special attention to her address. "You said you repaired the 'Spiritron Summoning System,' right?"
"That's right." Da Vinci pointed to the mysterious sphere above her head and said with a proud expression.
"This is the 'Spiritron Summoning System'."
"Eh?!" Fujimaru Ritsuka blinked her eyes. "Is that all it is?"
"It feels completely different from what I imagined..."
"Yeah." Da Vinci nodded. "I thought so too at first."
"However——" A clever light flashed in Da Vinci's dark eyes.
Then, she extended her hand towards everyone.
"I found that this thing... is quite fun."
As soon as she finished speaking, the hall plunged into darkness.
Immediately afterward, countless blue streamlines flew out from the extremely mysterious sphere, spreading out in all directions like pulses.
It was a scene that, once seen, could never be forgotten.
Snap—— Da Vinci snapped her fingers, and the hall instantly regained its light.
She herself, like a magician who had just finished a performance, bowed to the people before her.
"How was it? Interesting, right?"
"No!" Olga Marie woke up from the beautiful scene just now. "Was that originally there?"
"Why do I remember that the system didn't look like this when it was first activated?!"
"Eh?" Da Vinci covered her mouth. "Did little Director notice my newly created boot-up screen so quickly?"
"I thought it wouldn't be noticed."
"So that's why you didn't call me!" Realizing the truth, Olga Marie put her hands on her hips, looking very unhappy.
"Alright." Ian gently patted Olga Marie's shoulder, soothing her little emotions.
"Then Da Vinci-chan." The man changed his address. "You probably didn't just want us to see your newly made 'boot-up animation,' right?"
"Of course not." Da Vinci's fingers waved elegantly in the air.
"Actually... I just wanted to ask for your opinion."
"My opinion?" Ian looked a little puzzled.
"Yeah." Da Vinci nodded, then looked at the mysterious sphere floating in the air.
"Actually... I haven't completely repaired the 'Spiritron Summoning System' yet."
"Only the final step remains." Feeling the subtle worry in Da Vinci's words, Ian didn't hesitate.
"Then the fact that you stopped now means there's a problem?" Ian asked, his blue eyes looking at her.
"It's not exactly a problem." Da Vinci looked at the man before her, who had quickly understood her deeper meaning, a smile in her eyes.
"My Noble Phantasm 'Omnipotent Man' can use the magical power from the Holy Grail to repair Chaldea." Da Vinci explained.
"But the 'Spiritron Summoning System' seems to have been subjected to some special magecraft—this has led to the fact that although I can repair it, there are some mechanical problems that cannot be solved."
"For example?" Ian pressed.
"For example, such a summoning would have great instability... I can't estimate what kind of Heroic Spirit will answer our call, and I don't know if there will be any side effects."
"In other words." Da Vinci's gaze swept over everyone present.
"If we really want to activate it... it might even cause some problems for the summoner."
"..." "..." Ian finally understood why Da Vinci had called him over—the restarted Spiritron Summoning System had risks in its use.
This was indeed not something she could decide on her own.
However——
Ian didn't think there was anything to hesitate about.
He directly said,
"Da Vinci-chan, you don't have to worry about these things, just repair it directly." Ian said firmly, his blue eyes looking at her with determination.
"Really?" Da Vinci's expression looked a little surprised.
She probably hadn't expected Ian to give such a direct answer.
"Really." Ian confirmed his attitude once again. "You... just focus on repairing it."
"As for the subsequent summoning, I will do it—that way no one else will have to bear the risk."
"..." Da Vinci's eyes first showed surprise, then a hint of respect.
"As expected of Ian-chan, who dared to infiltrate the enemy's interior alone during the Singularities." Da Vinci said admiringly.
"You really act decisively."
"In that case——" Da Vinci's eyes were instantly filled with blue light, and her hair fluttered.
She raised her hand towards the sphere above.
"I can't hesitate either."
The Noble Phantasm "Omnipotent Man" was activated in an instant.
Countless amounts of magical power surged from all directions—it was the Holy Grail of the Singularities responding to the activation of the Noble Phantasm.
The mysterious sphere became even brighter.
The previous pulsations became more and more vigorous, allowing everyone present to hear a sound like a heartbeat.
"Alright." Da Vinci, using her Noble Phantasm, looked directly at the man with her blue eyes.
"Ian-chan, you can start summoning."
"Yeah." The man unhesitatingly came to Da Vinci's side.
He, like her beside him, reached out towards the Spiritron Summoning System, which embodied the hard work of Chaldea.
"Heroic Spirits of Pan-Human History, answer my call!"
The courage of this summoning seemed to receive some mysterious acknowledgment.
The danger that Da Vinci had worried about didn't appear.
Instead——
Five rays of light emanated from the mysterious sphere.
They spiraled and intertwined, finally converging in front of Ian, forming a human shape.
The light gradually faded.
The Servant's face appeared before everyone.
But after seeing it, Ian was completely stunned.
Because standing before him was none other than the fox spirit of the Heian period, Tamamo-no-Mae!
Only her appearance looked rather haggard.
"That's great..." Two lines of clear tears flowed from Tamamo-no-Mae's cheeks, dripping onto the floor of the hall.
"This concubine has finally found you."
Thump. The Servant, who had just manifested not long ago, collapsed completely.