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Reborn as Rias Gremory with a Multiversal System

TLHimejima
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Synopsis
Reincarnated as Rias Gremory, the fiery crimson-haired heroine of High School DxD, she quickly realizes that life inside her favorite ecchi anime is far more dangerous than it ever appeared on screen. Behind the glamorous façade of an elite devil princess lies a web of looming threats. The remnants of the Old Demon Faction coil in the shadows, the Calamity Group begins to stir, and catastrophic forces such as the Evil Tree and the Beast Emperor 666 threaten to plunge the world into chaos. Worse still, in the distant future stands a monstrous evil god powerful enough to overwhelm even the True Red Dragon God Emperor in mere moves and the mysterious Three Pillars, whose existence alone could shake the foundations of the underworld. And then there’s her own humiliating fate: reduced to a provocative title and treated as little more than a background fantasy for others. Refusing to remain a pawn in someone else’s story, Rias resolves to seize control of her destiny. No longer content with being a decorative “Switch Princess,” she sets her sights on absolute strength. Through strategy, alliances, and ruthless ambition, she will carve her own path, one of conquest, dominance, and survival. In a world where gods, dragons, and devils collide, can Rias Gremory rise above her predetermined role and become the strongest being in existence… or will the weight of prophecy crush her before she ever has the chance?
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Chapter 1 - Chapter 1: Chat Group

In the Underworld, within the Gremory Family—one of the families of the Seventy-Two Pillars of the Ars Goetia—the Head of the House gave birth to a 'freak'.

Born with high-intensity 'Destruction' power, it was a power that transcended the royal bloodlines of Devils.

Sirzechs Gremory!

The Destruction Magic Power released by Sirzechs at birth, and the quality of the magic covering the newborn, was completely unimaginable for an infant.

Under the influence of such magic, the furniture, sundries, and decorations in the room gradually deformed and disintegrated.

Even the doctors present during the delivery could not come into contact with this extraordinary magic.

His mother, Venelana, came from the top-ranking High-Class Devil family—the Great King Bael Family.

And the 'Destruction' magic power itself was a trait belonging to the Bael Family.

As for the Gremory, their only noteworthy traits were their vibrant red hair and their family-oriented nature, which made them seem like freaks to the rest of the Devil race.

A child was born into the Gremory Family, yet he possessed the powerful traits of the Bael Family.

Perhaps it was the Gremory trait—the latent ability to unearth treasures—working on himself~

As if sensing that the Devil race had reached a critical turning point of rise or fall, the Child of Destiny for the Devils was born.

Not only Sirzechs, who was the manifestation of Destruction Magic Power, but in the same era, a total of five such Children of Destiny were born.

Sirzechs born to the Gremory Family, and Ajuka born to a branch of the Astaroth family.

Serafall born to the Sitri Family, and Falbium born to the Glasya-Labolas family.

And from the Extra Demons of the Devil race, the Lucifuge clan that served Lucifer for generations, Grayfia.

As if by fate, the first four inherited the positions of the original Great Kings, while Grayfia became Sirzechs's wife and Queen.

Hundreds of years ago, during the war for Devil reform.

Sirzechs and Grayfia were enemies on the battlefield, but they eventually fell in love.

After overcoming countless trials of factional strife, the two finally walked down the aisle; their love story has become almost a legend in the Underworld.

On the other hand, perhaps signaling the arrival of a golden age, the Gremory Family welcomed another 'freak'.

Rias Gremory.

On the surface, the birth of Rias Gremory was far less dramatic than Sirzechs's; she was like an ordinary child.

However, this also signified an ultimate control over her own magic power.

And unlike Sirzechs, Rias possessed complete wisdom from the moment of her birth.

Although Devils are extremely precocious, being born with full wisdom was an anomaly among anomalies.

Even so, the Gremory Family, known for being sentimental, fully accepted this child and gave her equal love.

Three years passed in a flash.

The Gremory Family Library—

Little Rias was holding a book as usual, floating and wandering freely in the air.

Her petite body and the dignified posture hidden within her cuteness would make anyone marvel.

The girl of the Gremory Family would surely become a powerful beauty in the future.

Just like her brother, who became a Devil King.

One look at her, and great expectations would rise in one's heart.

However, for Rias herself, the opinions of outsiders had nothing to do with her.

In fact, after enjoying all the benefits her family provided, Rias had no intention of inheriting her responsibilities.

Perhaps this is the shamelessness of being an adult, of being a reincarnator~

"Time is truly something that is both pressing and worthless~"

Floating freely in the library, checking books, and constantly training herself and her Destruction trait, Rias would occasionally have some worries.

Devils have almost infinite lifespans, but for her, this infinity was not truly infinite because her future was fraught with difficulties.

The Chaos Brigade, the Evil Tree, Beast Emperor 666, and the Evil Gods of ExE—these were all reasons why she had to work desperately hard from infancy.

"Sigh."

She sighed, but a pleasant light flashed in Rias's eyes.

Although the enemies were powerful, Rias also found such a future interesting.

It had been three years since she crossed over to this world; the past often felt like drifting smoke.

There was no need for deliberate memory, nor a need for intentional forgetting.

Whether it was an ordinary life or the present where she was born with a mission, the days passed without a ripple.

As for whether she was happy, it was natural; being born into the sentiment-valuing Gremory Family, there was nothing happier than this.

It's just that she felt something was missing from such days.

Therefore, Rias's spirit of mischief began to burn fiercely.

But no matter what, life had to go on, and she had things she had to pursue.

Power.

To enjoy the benefits while spitting out the responsibilities, she needed great power.

Not just great, but omnipotent power.

Only then could she perfectly achieve her goals.

Because of her ultimate control over magic, Rias possessed potential far exceeding that of her brother, Sirzechs Gremory.

No one knew this except Rias and her family.

To perfectly utilize this potential, Rias asked her brother for the ultimate skill of Devil King Ajuka, the Kankara Formula (conqueror Formula).

One must know that Ajuka is a Transcendent, second only to Sirzechs, and one of the three Transcendents among Devils.

In terms of strength, he might rank second.

But in terms of versatility, he ranked first.

Using the Formula, he could even use an enemy's traits against them to defeat them; this included the royal Leviathan among Devils, who was defeated by Ajuka in this manner.

The unique Magic Formula, the Kankara Formula—this was Ajuka's ability as a Transcendent.

And getting it wasn't difficult; while everyone in the Underworld knew the four Devil Kings were close, no one knew they were childhood friends who grew up together.

It wouldn't be an exaggeration to say they were thick as thieves~

And Grayfia, Rias's sister-in-law, and Sirzechs didn't meet on the battlefield either; they met at age seventeen during the 'New Generation Devil Peers Exchange Meeting' convened by the Devil King families.

Sirzechs was a hero saved by a beauty, and then it was love at first sight~

Because Sirzechs displayed magic power far exceeding that of the Devil King descendants, he was feared by the royal families.

The royal families ordered Grayfia to monitor Sirzechs; this relationship lasted for over sixty years before they met on the battlefield as members of the Reformist Faction and the Old Maou Faction.

"Occasionally, I get jealous too..."

Rias thought, letting out a light chuckle.

"But compared to beauties, there are more important things right now—"

A light novel she saw in her previous life, High School DxD.

Being jokingly called by the perverted title 'Switch Princess' and becoming part of 'Cheng Ge's' harem—she would politely decline such things.

Beautiful flowers should be with other beautiful flowers, a riot of colors.

As the heroine, maintaining a dignified and beautiful posture, and preserving that beauty eternally—that was what she wanted.

And she had no need for a creature like a male protagonist.

Given how disaster-prone this world was, living a good life wouldn't be easy.

The most important thing was power!

"The future is fraught with difficulties."

Sighing lightly, a voice seemed to ring in Rias's mind.

"The Multiverse Chat Group invites you to join. Yes/No—"

Revealing a hint of surprise, Rias closed her eyes, and an interface appeared in her mind.

"Ding~"

"Rias Gremory has joined the Chat Group~"

"Jibril has joined the Chat Group~"

"Unohana Retsu has joined the Chat Group~"

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I hope you're enjoying the fanfiction so far! If the story has you hooked and you can't wait to see what happens next, you can unlock 30 chapters in advance over on my Patreon: patreon.com/TLHimejima1

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