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The group of girls truly wanted to stay and watch how Marcus worked. But… They have school! And since Serafall is here and they didn't want to look like they are incompetent and can't do their duties properly.
Especially since they were the ones who asked to come to the human world in the first place! They needed to attend their classes. Thus leaving the Genius inventor alone with the Satan.
It was the first day of human school for Rias and Sona, but their minds were not on the classes.
All they could think about was the guy downstairs setting up a surveillance system for their town. Especially since Serafall has hyped him up so much, they needed to see him work!
And so the moment the last bell rang, they rushed downstairs to see what was going on.
…
…
…
"What is that!?" Rias asked with wide eyes.
"It looks like a diamond…" Sona said while adjusting her glasses.
"I know it looks like a diamond, but diamonds don't glow or emit white glowing particles…" The redhead said with an eye roll.
"True. And I am just telling you what I see." Sona snark back as she shrugged.
After their small shock, they walked into the room. Looking around, they could see that it was now some sort of a ritual room combined with a sort of Sci-fi reactor type room.
Some types of Glass panels were spinning around the diamond. The two devils assumed that they were absorbing the magic energies which were being emitted by the diamond-shaped thing…
There were also runic carvings spread throughout the whole room. Walls, ceiling, ground. Nothing was spared, and by this point; the pair were wondering just how quickly this man worked. Even a devil takes his time when doing rituals like these…
Yet, he did all of this during the time they were attending classes.
"Ummm… I thought Barrier things like that are magical… Why is there a computer terminal of sorts there." Rias asked Sona with a confused look.
"Why are you asking me? You think I have a clue of what's going on here?" The younger Sitri almost hissed at Rias from annoyance. And frankly, she is feeling quite inadequate. She saw runes from at least 3 different cultures, and she can bet that there were others that are from different supernatural cultures as well.
Meaning that Marcus knew more than her! And she spent most of her life in a library! Her brain was trying to come up with some sort of explanation on how this is physically possible…
"I thought you knew more than I did…" Rias said with a casual shrug.
All she got back from her friend was a hiss. The younger Sitri just hissed like a cat at Rias, who found it incredibly amusing.
"No I don't… this is beyond me," Sona said to her redhead friend before looking around for the teen inventor. Moments later she finally found Marcus.
The genius inventor was sitting in front of a table with a futuristic laptop on top of it. There were several cables connected to it, these cables were also connected to the Diamond-shaped barrier reactor.
Sona then saw her older sister sitting on the table with a book in hand. Meaning that her older sibling was here the whole time.
All the younger Sitri could think of this situation was that, yes… The Satan Leviathan is pretty much infatuated with a human inventor to the point that she spends the whole time with him regardless of anything…even work...
She wonders what would happen if the people of the Underworld learned of this?
A shiver went down. Just imagining the chaos. One of the most powerful devil females infatuated with a human.
"You two are here. Nice. Come over. Let me explain some things."
Hearing his voice both of them were stiff for a bit. Nonetheless, they quickly went over.
Serafall lifted her head from her book and looked at the pair. She smiled before going back to her book.
Sona didn't know if it was a good type of smile or a bad type of smile… Well, time will tell.
"First the barrier core." Marcus pointed at the diamond-shaped core casually from his chair. And yes, it was a comfortable PC chair that he got from somewhere.
"The official name is the Diamond Core Heart. It's something I have designed and created myself. The core reactor was carved with magical intent to give it more sturdiness. It has three protection layers. Since this one has a slightly different purpose from mine, the first two layers are spread throughout the whole city.
The first layer is surveillance, the magic that spreads throughout the city observing its population. Once a certain threshold of magic is reached, the magic will react to it and let you know. This is where the second layer comes in place. Observation. Once that threshold is reached, the magic will show you who it is and where it is. And lastly the third layer. The third layer is protection. It can only be activated manually from this area. It turns school into a fortress that even Ultimate Class Devils will have an issue with breaking through." Marcus gave a long yet brief explanation without even breaking his facial expression.
Both listened with abrupt attention. The pair were quite fascinated and awed by what they heard. This thing protects against ultimate class devils attacks?
"Where does it get its power? I do believe the Shinto Pantheon will be...dissatisfied if they learn that we drained Japan of magic to kick start this…" Sona said with some concern.
"It's based on Marcus M.T.M technique," Serafall said from the side as she was playing with her.
"What do those letters stand for?" The younger Sitri was very curious about this... technique.
"Motion to Magic. The core was kick-started by a motion that created magic. Once that is done that magic enters what is called a loop of magic creation. A loop-based reactor. In other words, it creates magic from nothing… and it will last forever." The older sister of Sona explained with a casual shrug.
"So you did listen to my explanation," Marcus said with faked awe.
"Of course I did!" She exclaimed, almost angrily.
"Well, it was hard to tell, especially since you were spacing out." The genius inventor shrugged at her.
"Of course I was spacing out! You just told me that the reactor will last as long as the planet! I was shocked and awed and all the other stuff when one is gobsmacked…" The Leviathan said that in a single breath.
"Hmm… right, well I went through that days ago when I finished the maths behind it. I guess you need real proof." He said with a shrug.
"Hmm? Are you still awed by your stuff?" She asked curiously, forgetting about previous comments for a moment.
"On a theoretical level. When I realise that I got it down and the item's possibilities." He explained to her as his gaze returned to the pair who were listening attentively to what they were saying.
"Now for the part in which I need you two," Marcus said as he got up from the chair and started walking towards the computer terminal.
"I will add you two into the system. At this moment the Core is only working in this room. To make it citywide you will need to send your peerage members to mark the boundaries of the barrier."
"I understand/I will do it." Both nodded and answered at the same time. Marcus prefers them this way, after all, he watched the anime and knows how these two can be and how much trouble they can end up in.
Now, it will be even better. They are going to get monitored by him 24/7… meaning that, the moment they are slacking in their jobs he can instantly report to either Venelana or Serafall. He might not be their father but they are part of his tests… and he has fired people for less in his previous life.
"Good to hear." He nodded at their response before walking over to the computer terminal and starting to press buttons on the screen.
"It's a touch screen!" The redhead whispered at Sona. Who nodded, looking very curious. All she could see were letters and numbers on the screen. She has no idea what is going on.
That was until the screen went dark and then restarted itself.
This time the screen showed 'Aurora Borealis', before the lights formed into letters showing 'Aurora Terminal v1.0'.
Seconds later the letters faded out and showed a very futuristic terminal. To Rias, It looked like something ripped right out of an anime or a video game.
She could see the terminal taking readings from the diamond core. Showing them in numerical values and lots of spinning icons… the redhead felt that it was… way over her head.
After pressing on the terminal Marcus looked back at the pair.
"Put your hand on the screen. It will register and link you to the barrier." After saying that he took a step back and made some space for the pair.
Both of them nodded seriously. It looked like they were about to do something intensively big… the genius inventor internally rolled his eyes.
The first one to step up was Sona, she looked at the screen and saw a window that said [Register New User] and below it was a simple image of a palm.
She figured that she had to put her hand on that specific area.
Without wasting any time she put her hand on the image. Instantly, she felt some drain on her magic.
Her eyes widened. That moment she knew that it was a seamless magical machine!
She could not even see the difference between magic and technology by this point! It was just that good!
Soon enough she saw her image. And a full 3d profile has been constructed on her! even her occupation has been filled up! This was the most powerful registering tool she has ever seen.
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