During the Great War, the freat Satans and the God of the Bible lost their lives, leading the three fas to retreat aer a cold war that persists to this day.
However, after about a tury, the devils had a civil war, dividing them into two fas and redug their numbers further. The fas split due to the desdants of the previous Satans, who still held a war-hungry mi.
These desdants, calling themselves the Satan Fa, wao tihe war despite being on the brink of extin. In opposition, a fa was formed, known as the Anti-Satan Fa, who believed the war ointless and advocated for waiting until they had enough mao proceed.
The fas fought politically until the House of Asmodeus ordered the extermination of the Satan Fa, sparking a civil war. The Old Satan Fa was eventually defeated by the rebelling Anti-Satan Fa.
Sihe neointed Satans were killed in battle, the leaders of the Anti-Satan Fa were elected as the new Satans, ed as Lucifer, Leviathan, Asmodeus, and Beelzebub. They reuhe Devil World, w toeace.
Meanwhile, houses and devils, mainly the nobility who supported the previously killed Satans, came together to form a new fa called the Old Satan Fa. This fa was tightly trolled by the House of Bael for unknown reasons.
Within this fa, two groups formed: one remained in the underworld, causing trouble, while the other fled to various pces, vowing revenge.
Most of those who fled joined an anization ter known as the Khaade. Although it was said to be led by Ophis, the Ouroboron, the true mastermind was Rizevim Livan Lucifer, a desdant of the inal Lucifer.
Rizevim was an odd devil, even among devils. He had no hunger for power, only a desire for chaos aruaking him a threat to many fas. As a result, there was a rge bounty for any information on him. Why not for his head, you ask? Well, it’s because he is to for normal bounty huo handle. As the first-ever Super Devil, his ruck fear into all, especially after it was discovered that Sirzechs Lucifer, formerly Sirzechs Gremory, was also a Super Devil.
As maniacal as Rizevim was, he was also a brilliant researcher. Even Azazel had to show respect for his talents. However, his research was naturally of a nature that few would appreciate. His current project was recreating the 72 Pilrs. But unlike his father, he wao create individuals who could harhe full power of each pilr.
For this, he found a suitable experiment subject, which led to the current situation.
Rizevim stood before a test capsule, inside of which was a girl, around five years old. She had silver hair and a doll-like appearahat might have tempted some less-than-moral individuals (lolis).
Rizevim couldn’t believe his lu finding this spe. Just as he was about to leave the underworld, he discovered her in one of the hidden chambers of the castle. Acc to the research papers he found there, this girl was supposed to be the trump card his father had created for the war. Unfortunately, his father never got the ce to use her.
Rizevim took her with him to iigate what made her so special, and to his astonishment, she erfectly patible with all the powers of the 72 Pilrs. Thanks to her, his research had progressed signifitly.
However, Rizevim never imagihat this girl was more special than even he realized. She wasn’t just an experiment. She was the daughter of the inal Lucifer and a fallen angel. A perfect hybrid that broke the bance. And if that wasn’t enough, she was also our protagonist, Yumina Akihito.
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**Yumina POV**
‘Argh, that old hag! Did she really have to shove me out like that? I mean, it’s a new experience, sure, but WTF... Argh… Wait, where the hell am I? Why do I feel like I’m drowning, and why ’t I open my eyes?’
\[Master, I am actively restrig your body. If you move even a little, you might be immediately captured.\]
‘Wait a mihat voice… Ciel? Is that you?’
\[Yes, master, I am here.\]
‘So, um, Ciel, where am I right now?’
\[From my analysis, it appears we are in a boratory. The energy signatures I have detected suggest that we’ve been captured by devils. The one leading them has an energy signature simir to yours, master, meaning he is likely one of your retives.\]
‘Retive? That’s impossible. I wished for my lio be ected to Lucifer, so the only retives I could have would be Vali or… Oh no… Ciel, you use universal dete without alerting anyone?’
\[Yes, master.\]
Soon, the darkness clouding my vision faded, and I could see my surroundings. Only one word came to mind: ‘A torture b.’
There were various tainers, all housing different creatures—angels, demons, and youkai. In front of my capsule stood a man with silver hair and a matg beard. Isn’t this Rizevim, the hidden boss of *High School DxD*?
‘Ciel… the retive near me… It’s not him, is it?’ I asked, already knowing the answer.
\[Yes, master, it’s him.\]
‘Sigh… So he experiments on his own family. Typical. This is the guy who killed his son just to get his grandson to awaken his Sacred Gear.’
After a round of sarcastic praise for Rizevim, I asked Ciel something I was curious about.
‘So, who am I to him?’
\[My analysis indicates that you are the daughter of the inal Lucifer and a fallen angel, making you his half-sister.\]
‘Half-sister, huh? Not ideal, but who cares? I just wahe versatility of being a Lucifer.’
‘Ciel, you create a status s for me?’
**Name:** ????? **Race:** Hybrid Devil/Fallen Angel **Father:** Lucifer **Mother:** Azrael **Bloodline:** Lucifer Devil Bloodline, Lucifer Angel Bloodline (sealed), Azrael Bloodline (sealed) **Legacy:** Angel of Death (sealed), Ruler of the Underworld (sealed), Successor to the God of the Bible (sealed), Void Empress **Magic:** Death Magic (sealed), Demonic Magiagic (sealed) **Skills:** Power of Death (sealed), Soul Sear (sealed), oion, Void God Azathoth, Manas Ciel, Heaven’s System Administrator (sealed) **Mana:** Ultimate Css **Strength:** Lower Css **e:** Lucifuge (sealed due to restraint)
‘Wow… I’m a lot weaker than Rimuru thanks to that goddess messing with me, but with Void God Azathoth, I should be able to survive anything. Still, I’m surprised I’m the daughter of the Angel of Death. She was never mentioned in the novel or anime… I guess she died during the Great War.’
‘What the hell is up with my magic stat? I know the Lucifer bloodline grants a lot of demonic power, but this is ridiculous.’
‘Hey, Ciel, what does that "Legacy" thing mean?’
\[It refers to the titles you’ll i from your parents. Since your father, Lucifer, was the first angel God created, he was the successor to Him. Additionally, due to your Lucifer blood and yh affinity with souls and the void, the underworld has chosen you as its ruler. Your mother, Azrael, was the Angel of Death before she fell. With her position vat due to the Great War, you are her successor as well.\]
‘Ciel, what does that "e" seean?’
\[It indicates that the Lucifer house has a soul tract with the Lucifuge house, so as a Lucifer, you naturally have a Lucifuge by your side.\]
‘But I thought the Lucifuge household was destroyed.’
\[ive, master. It appears there are three remaining members of the Lucifuge household, and only one is patible with you.\]
‘Wait a minute… In the here were only supposed to be Euclid and Grayfia. So who’s the third person? Don’t tell me that goddess added another Lucifuge to match my in.’
‘Ciel, you locate this Lucifuge?’
\[Yes, master. Her mana signature is ing from the human world.\]
‘Well, that means my stop is the human world. Ciel, you use Spatial Domination from Void God Azathoth to teleport me near her?’
\[Okay, master, but I reend staying here for a few days due to some outside interference.\]
‘Hmm… Why is that, Ciel?’
\[I’ve detected fn substances inside your body. I believe you gain new powers by fully iing them.\]
‘How long will that take?’
\[About three days, master.\]
‘Sigh… Looks like I’m stuck here for a while.’
I thought to myself, w what to do for the hree days. As if ohe door to this cursed room opened, and Euclid walked in.
"Rizevim-sama, our spies mao locate a Belial desdant in Kuoh. Her name is Criel Belial, cousin to Diehauser Belial, the current Rating Game champion."
Rizevim turned around, a wicked grin on his face. "Oh, that’s good
news. I was just thinking of searg for some materials."
Euclid asked, gng at his notes, "How is the experiment going so far, my lord?"
Rizevim hummed in thought. "For now, she’s very stable, even after we infused her with the bloodline abilities of the Power of Destru, the Power of Time, and Hellfire regeion from the Phoenix, os, and Bael s. If my estimates are correct, our test subject may asd to the Super Devil rank without any training. And if that happens, my other project will also be pleted."
Euclid nodded. "She should be a fine prototype, but Rizevim-sama, would this girl even survive? It would be a huge waste if we destroyed her by being too hasty."
Rizevim sidered this and agreed. "Yes, it would certainly be a waste. I'll hold off on more extreme experiments until we find a rept."
ging the subject, Rizevim asked, "So, how’s my grandson doing, Euclid? Did he die fighting a wild animal or something?"
Euclid chuckled at his lord’s dark humor. "Sadly, no. He didn’t enter any wild animals, just a foolish fallen ahat idiot thinks he’s free just because Azazel took him in. Shall I finish him off?"
Rizevim waved his hand dismissively. "Don’t bother. Let him live. Who knows, he might produe fine spes if he ever gets id."
Euclid nodded, about to leave, when he suddenly remembered something. "Ah, Rizevim-sama, the Tepes fa has agreed to ally with us. Will you go there to finalize the deal, or shall I ha?"
Rizevim thought for a moment before answering. "No, I’ll go personally. I have some free time before ture the Belial. And it would be easier for us iiations if I were there."
Euclid bowed. "Then I shall prepare for your departure," he said, and with that, he left.
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