Prologue

Many millennia ago, there lived an ancient race who carried the very lifeblood of Gaia herself. The Cetra, a race of beings who were meant to be the guardians of the planet and maintain the balance between the three realms themselves. They were a peaceful race, living sages who had power that one could only imagine. However one day a beast of immense power known only as Jenova came to Gaia from the eternal abyss of space, her only goal was to drain the lifeblood of Gaia and devourer the planet. The Cetra gathered to combat this great threat; many lost their lives to the great beast and the battle lasted for years. Try as they might they stood no chance against her power. With no option left they gathered all their remaining power into separating Jenova into Seven pieces and sealing those pieces into places where neither life nor death could ever hope to reach.

Now that the Cetra were practically extinct the forces of heaven and hell fought against each other for the right to claim the Third Kingdom. Yahweh, realizing this took the life-force of Gaia and created the first humans and proclaimed them as rulers of the Third Kingdom. However he did not realize that Jenova's presence had corrupted the planet and thus the humans became corrupted as well.

One such human, named Trihexa, had bathed in so much corruption that she was able to hear the voice of Jenova which drove her further to insanity. She proclaimed herself as a daughter of Jenova and seek to free her 'mother' from her prison. Through finding the 'blood' of Jenova inside of the Lifestream she drank it and gained unimaginable dark power that could rival if not surpass the Cetra themselves and was called the Beast. Though she could not find a way to free her 'mother's' body she had found a way to free her soul by allowing her to possess her through the Lifestream.

In honour of her 'daughter's' sacrifice she took up her name; Jenova was free once again to reek havoc upon the world and was proclaimed as the Emperor Beast of the Apocalypse. Yahweh seeing this had no choice but to fight the Beast as the Cetra were no more; the battle was even fiercer than the previous one, despite being seemingly matched Yahweh was loosing ground to the more powerful dark deity and he realized that it was impossible to kill her. With no choice he used all his remaining power to rip her soul out and seal it with 1000 forbidden class seals so she could never be free or even influence another victim ever again, no matter how corrupt they are.

However the cost was high, Yahweh soon died from exhaustion leaving Heaven leaderless and without their father. He died happily knowing that Trihexa will no longer be able to reclaim her freedom once more; though what he did not realize was that the lifestream was still corrupt with her influence and that he had completely forgotten about the corpse of Trihexa who's flesh and blood will continue to be used to create more like her for centuries to come…

A little girl no older than six was waiting next to a closed door with an expressionless face despite the screams of pain coming from within. The little girl had long pink hair with a streak of silver in the middle, her eyes were a dark purple colour with flecks of emerald green in them and were strangely enough slitted like that of a cat's… or a snake.

Her face showed a level of maturity & emotionless that no child should ever have even though her mother was currently in tremendous pain from giving birth.

Eventually the cries of pain had ceased and were replaced by the cries of a newborn.

The door opened revealing a maid who looked quite relieved.

"Come mistress Sephirah, your mother awaits."

The little girl named Sephirah simply followed the maid.

Inside were two more maids who were attending a woman laying down on a bed and holding two small bundles closely to her breasts. The woman, despite her exhaustive state, had such an unearthly beauty that many would think she was actually a goddess of beauty. She had long bright pink hair that reached to her knees, bright violet eyes full of life unlike her daughter's dark purple dead-like eyes, and her body was quite shapely with large sized breasts that women would kill to have.

"Sephy… come here and greet your new sisters."

Sephirah approached and peered curiously at the two bundles.

Two identical twin baby girls with very short pink hair though only one was crying like a normal newborn should while the other was too quiet and if it weren't for the deep breathing she would think that she was dead.

Unconsciously she reached out to her sisters; the cryer stopped crying and remained silent, while the seemingly unhealthy one started whimpering. Eventually when her hand got too close, the sickly one whimpered even louder and tears started forming in her eyes.

The mother flinched, while Sephirah retracted her hand.

"Sephy… please don't…"

It was too late as she quickly turned to leave… Or at least would have if it weren't for something tugging at her hair.

She turned back and was surprised to see her other sister holding her hair.

With a grunt of annoyance she quickly let out some killing intent, causing the maids to gasp in fright and for the sickly sister to whimper & cry some more. Yet the brave sister simply… glared at her(?) and puffed her cheeks in annoyance.

Baffled, she once again got close and tried to pry her little sister's hands of her hair only for her to quickly grab tightly to her finger. Sephirah swore that she was giving her a smug look that said 'you can't get rid of me that easily.'

Her heart was thumping quickly with unknown emotions. She didn't know why but she slowly grabbed her from her mother's arms and into her own.

Slowly the newborn opened her eyes, revealing a bright violet like her mother's, and when she gazed upon her older sister's face… she smiled; her eyes filled with nothing but love & happiness for her sister.

Sephirah looked at her stunned, not knowing what to make of this. This was not the look of fear, horror or disgust that she was so used to seeing from others.

Her heart beated faster and tears started forming in her eyes.

'I don't understand… why…?'

Her thoughts were interrupted as her little sister stopped smiling and frowned. At first Sephirah thought that her little sister came to her senses, however instead she raised her pudgy little arms at her. She was confused on what her little sister was demanding while her little sister puffed her cheeks in annoyance and started to whine.

Finally figuring out what she wanted, she brought her slowly towards her face and when she was close enough her little sister instantly started rubbing her hands right under her eye. Sephirah was confused until she realized what she was doing… she was rubbing her tears away.

At this realization more tears poured out of her eyes.

'Why…? Why don't you fear me? Why don't you hate me? Why… do you love me?'

The little sister tenderly rubbed her face on her older sister's cheek.

Not being able to take it anymore Sephirah clung to her little sister and finally let her despair & happiness out: Despair for how life hates her and happiness for someone who loves her.

Her mother watched ecstatic at how her oldest daughter had finally shown emotion after all this time. To her this was absolutely the best day of her life.

The little sister simply snuggled in deeper in her older sister's embrace and cooed at her.

It was then that Sephirah made a promise: She would always be there for her, to protect her, to love her… and she will destroy and kill ANYONE & ANYTHING that would dare try to take her happiness away.

Even if that threat… was her own mother… or her own sickly sister.

Author's Notes

Alright here's my first triple crossover of High School DxD/Final Fantasy & Nasuverse!

Also this is my second Yuri fic so if you don't like it then just go away!