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[Advanced 150 Chapters on my patreon.

Patreon/Pleam]

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[User Number: 01]

[User Na: Sona Sitri]

[User Species: Pureblood Devil From 72 Pillars]

[User Occupation: City Overseer]

[User Clearance: Barrier User]

"It did all that from just taking a bit of my magic?" Sona asked with sweat rolling down her forehead. This stuff is incredible!

"Indeed. It was reading your magic. Now Gremory you're up next."

Hearing that. The younger Sitri walked away and gave so space for Rias. Marcus quickly set it up to register for a new user once more.

The redhead quickly did the sa as her best friend. Only that, she didn't mingle much in front of the terminal. She was very satisfied seeing how perfect the 3D copy of her was.

[User Number: 02]

[User Na: Rias Gremory]

[User Species: Pureblood Devil From 72 Pillars]

[User Occupation: City Overseer]

[User Clearance: Barrier User]

"Now that you two are connected. Let's test it out." He said that before looking at Serafall.

"Sera, make your presence known."

Hearing his command the Leviathan called forth her magic.

At that mont both Sona Sitri and Rias Gremory experienced sothing akin to a vision.

They saw Serafall channelling her magic in the basent next to the Diamond Core Heart.

"This is incredible... Will we be able to sense anyone in the town?" Sona asked while making sure her glasses didn't fall off. Now she understood the full scale of this barrier system.

It's simply priceless!

Serafall smiled seeing how her little sister finally understood what this ant.

"Indeed. The mont soone raises their power beyond a certain level, it will react. I made it especially potent against non-devil magic users. aning that you will be notified the mont soone like an angel or a fallen angel appears in the city." Marcus explained to them.

"This is incredible... it's like a system of so sort of barriers!" Sona said after realising what this ans.

Serafall smiled for a bit. If only her baby sister knew that this was based on the Heaven system! She would probably pass out!

"You can see it in more detail if you get closer to the diamond core." He said with a smile. And Sona quickly walked over and got a closer look.

Seconds later the younger Sitri gasped.

"It's... like a complete ecosystem of so sort!" Seeing how Sona reacted, Rias walked over and checked it herself.

"It's...beautiful..."

"And complex! Most importantly it's magically based! It's like technology but created through pure magic!" The younger black-haired devil said with the awe of a small child. She then looked at Marcus with stars in her eyes.

"How did you make all those magics from different pantheons work so seamlessly! This is simply incredible!"

"Well they were like a puzzle, the difficult part is figuring out the shape and where you have to place it in a big image." He explained simply.

"But...that should take hundreds of years of studying!"

"Or soone a little bit smarter than normal, finds a pattern and figures it out." He said with a shrug.

"...Yes... 'little bit'..." Sona said, her eyebrows twitching. She had the urge to punch him but she resisted it.

A little bit does not describe what he just did. In layman terms, Marcus basically 'unified' the whole world's magical languages into one universal language and then used it to make the magical equivalent of a computer.

If that's a 'little bit' then she should be considered a vegetable...

And the rest of humanity drooling atbags...

"Indeed. This is nothing more than a little brother compared to what I have built in my place..."

Sona gulped down hearing that. If this was just a little brother, then how complex and big was the diamond core in his place?

'Wait! Sister said that he has Pantheon worthy protection... Does she an in the literal sense?' The younger Sitri's eyes widened, and her face pales...

Now she has started to see truly how much he is worth. No wonder Serafall threatened her multiple tis over that eting.

"...For the next part, I want your peerage mbers to split up and place these markers just outside the city limit. It will work like boundaries. Once it's done, the Diamond Core Heart surveillance will activate." Marcus pulled out a pair of briefcases from thin air and gave them to the confused pair of girls.

"Inside of these, there are instructions on how to do it. Think of this as the first mission from as my devil contractors." He said, quite seriously and the pair quickly nodded.

"Leave it to us." Sona professionally said while fixing her glasses, she was going to perfect this no matter what. Sa with Rias.

~~~~~~Few Days Later~~~~~~

For the past several days, Marcus has been living in the Sitri Estate in Kuoh.

Even then, Sona had no chance to even have a proper conversation with him!

And it was just infuriating! A man which she sees as the next genius of the millennia is living under the sa roof as her and she has no chance to ask... tons of questions!

It was just annoying! Nonetheless, it was partially her fault as well. Because she spent countless hours with the markers and testing this incredible surveillance system!

Once it was set up she could utilise sothing akin to the view from the eyes of a bird and check the city from the top.

It was just that great! Not that her happiness will last for long as she soon realised that Marcus will be leaving. Since officially he was just on a holiday leave. And because Japan doesn't have those two weeks of Christmas Holidays like the European countries do. On paper, he was just on holiday in Japan.

And he will be going back to his country soon. This ans she doesn't have much ti left! That's why she decided to look for him and... befriend? Maybe get so missions? Learn sothing from him? This was one of those monts when she didn't quite have the ti to even think of a proper plan...

In the end, she arrived at one of the living rooms where she knew he was staying.

She was about to call for him but then she felt her sister's presence! Sona quickly reeled in her magic as much as possible and decided to listen in!

This was the perfect mont to find out how deep of a relationship her older sister has with him!

Slowly she positioned herself so that she could have a look. Leaning close to the wall as much as possible.

Finally, she was able to see him without any obstructions!

And her cheeks instantly exploded with a blush. She saw her sister sitting on his lap in a very intimate position while he was reading sothing from a device.

"How long do you think it will take for those two to figure out that they can track Sacred Gear holders?" Sona heard Marcus' voice. The younger Sitri assud that he was asking this to her older sister.

'We can find Sacred Gears with this? Just how good is this Diamond Core Heart?' Sona's heartbeat accelerated just thinking of how quickly she will be able to fill up her peerage if this is true!

"Fufufu... how many secrets did you leave for those two?"

The younger Sitri blushed more when she heard how seductive her older sister was sounding!

'Did they already go the whole way!? Damn sister! He is as old as I am! Still though... he is... hot...and...super smart... Well, calling him just smart is an insult... genius maybe? Yes, genius... And his body is.... That confidence...' Sona shook her head. Her mind was going into the gutter! She needs to learn more instead of having these thoughts!

"Quite a bit, they will be able to learn it if they are driven. So, instead of going in circles, give a non-bias version of what you think."

The younger Sitri was impressed by how he was holding back against her seductive older sister! She was quite impressed by his resilience.

Sigh

"Fine. If you insist. Sona will discover most of the functions first. Since she is more driven than Rias. Who is by all accounts just playing around." The Leviathan explained what she was thinking. Her younger sister was slightly feeling proud of herself that her older sister has such a positive non-biased view of her.

"Gremory is not playing around. She is running away. She believes that all her problems will be solved by themselves. That is what I found out about her. This girl is a classic princess who believes things will fix themselves. Simply put, she is waiting for her hero to pick her up. Once that is done she will start moving."

Sona paled after hearing that. He already has Rias completely figured out? But, he was not even around her!!!

'What kind of monstrous existence is this guy!?' The younger Sitri felt chills going down her spine!

All she heard was Serafall's laugh.

"That's why I like you so much! You could easily be a Satan!" The older Sister of Sona laughed with an extrely amused tone.

"You must be joking. You want to govern? I will turn the whole population into test subjects if I beco a leader." She heard him say with a dull tone.

Just imagining a whole population turned into test subjects made Sona shiver. This sounds like what a real Diabolic Devil would do!

"Hah! You didn't see Sona or Rias complain! They were excited to test your things!"

That mont the younger Sitri realised that yes... she is already a test subject! And she didn't even realise it!

"Nope. You just want to beco a devil and take Lucifer's position or sothing..." He said that with a sigh.

Sona could already imagine that. Serafall probably just wants that so that she could flaunt her boyfriend, by that ti Husband, to the rest of the devils... more specifically the council...

[150 Chapters on my patreon.

Patreon/pleam]

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