The Protagonist's Sister Is Actually The Strongest

Anna didn’t need to speak. She simply pushed upward with every ounce of strength she possessed, and her adoptive family matched her effort without hesitation.

RUMBLE!

The skies shuddered as the colossal shield began to rise against impossible odds.

“…?!”

Cracks spread rapidly across the Eye. Sparks of electricity burst from the fractures.

The Void Ruler stood frozen…

Utterly speechless.

In that instant, Anna’s mind linked with everyone around her.

“Let’s combine our power! Pour it all into the shield! NOW!”

They nodded without delay. Anna’s lips curved into a fierce smile.

“Take your shit back!”

With a raw, vulgar shout, she triggered the shield’s ultimate ability.

“{Divine Heavenly Harmony Dragon’s Breath}!”

A gigantic Chinese dragon head materialized from black and golden light. It unleashed a devastating breath attack, channeling every bit of absorbed damage and power back in a single, overwhelming surge.

The beam collided with the Void Ruler’s laser. It grew stronger and larger with every fragment of energy it devoured, until finally it overpowered even the Universal Computer’s assault and…

BOOOMMM!!!

…struck the artificial eye head-on, shattering it into countless pieces.

“A̴̧̧̨̱͖̗͍̦̗͈͖͖͈̪͊̌͌́͌̿̎͆̐͜A̷̢̦͎̝̜͚͙̻͙͒́̾͌̈́͌̏̓͂͋̒̈̒̎̕ͅͅȀ̷̡̨͕̪̏A̵̧͚͕̭̻̬̖͈̫̥̬͕̫̐F̵̤̝͉͙̟͕̱͖̤̘̖͖̖̲̎̾̈̆̌̊͌͗̔̕F̷̡̢̢̻͍͈̭̹̍̄̑̑̓̋́̐̋F̸̢̛͕͙̳̠̫̼͉̯̜͎̍̍̈́̎̚͠͝W̸̮̙̼̗̹̰͊̌̓͋̔̅͘J̷̢̢̛̳͈͇̰̯̦̭̲̳̞̫̌̍̑̑͛̑̀̃́͆̽͆̄̚2̸̡̢͖̝̙̩̼̙͕̩̻̠̟̪̮͌̐͊̀̆̈́̑̓̈́̚̕͘̚0̸̟͉͎̩̩̐̕1̸̢̳͎͕̯̗͛2̶͖̣̣̞͖̠̥͇̙͔̏̀̿̓͂̓ͅS̴͓͓̥̜̬̤͈̪͊̂͌́̈́̀͜͝͝H̵̪̞͑͐Ȃ̸̢͈̗͙͉͍̣̞̥̦͎̜́̎͜Ś̷̢̢̻͓̗̖͙̳̯̠͙̩͖̓A̷̫͆́̇̇̃͑̀͝0̶̲̠̘͚̩̲͔͊̑̓̎2̵̤͎̀͂̒̆̓͋̚0̷̧̺͈̫̥͇̥̲̰̊͐̑͗̈́2̸̩̩͕͓̭̺̂̇̀3̸̫̈̈́̊̏̿̀̕͝͝Ȩ̷̱͈̯̖͎̯͚͙̓̌͘͜Ş̸̡͓̱̥̝̪̥͓̹̦͍̮̀̀Ṣ̵̣̘͙̬̰͔͉͗͒̉͑͌̓̍ͅͅ!!!!”

The monstrosity released an agonized, glitchy scream—artificial and piercing. Most living beings nearby clutched their ears as their eardrums threatened to burst.

FLUOSH!

Gasping for breath, they stared upward in disbelief at what they had just accomplished. Below them, the seas surged violently, rushing to fill the enormous crater they had torn open. The hole had come perilously close to the planet’s core. One misstep and everything would have been lost.

“Haaahh… Haahh… W-We did it…!” Anna whispered. “We actually pushed that thing back… even if just for a moment!”

“A moment?” the Heavenly Empress asked.

“It’s obviously coming back! Look—the cracks are spreading everywhere!” Anna pointed. “We have to hurry…!”

Her gaze snapped to the Demon King’s sealed body floating in midair.

She needed to secure it immediately. It might be the key to surviving whatever nightmare the incoming invasion would bring.

“We have to secure the Demon King’s body!”

“Right! Let’s move!”

The Heavenly Demon nodded firmly in agreement.

The entire group surged toward the sealed figure. Suddenly the cracks widened further, stretching across thousands of kilometers.

Then a new fracture appeared directly opposite the Demon King’s body.

Crack… crack…!

CRASH!

A massive rift tore open, resembling the Gates Anna had seen on Earth, yet far darker. Black and purple with roaring red flames, it radiated…

An overwhelming torrent of the purest, foulest Demonic Energy imaginable.

“W-Wha…?!”

Demonic presences materialized instantly. A pair of gigantic, long, black insectoid claws ripped through the fabric of space, forcing the gate wider.

From within emerged a massive insectoid demon. Huge red eyes gleamed. Its humanoid fly-like form was encased in black armor, and enormous black-and-purple wings spread behind it. A swirling aura shaped like thousands of flies surrounded him.

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“We meet once more, Anna!”

“What the hell…? Beelzebub?!”

Anna could scarcely believe it. Of all beings, Demons were arriving now—and Beelzebub of all of them!

But why him? What was happening anymore?

Had that computer allied with Demons?

Why would they even do that?

“No… I don’t have time for this!”

She dashed toward the Demon King’s body, but Beelzebub was closer. His giant jaws parted in a grotesque smile as his claws reached out.

“THIS BODY SHALL BECOME MINE! I WILL BE REBORN AS A TRUE DEMON KING!”

“IN YOUR DREAMS!”

Anna’s Myriad Self Aura exploded outward for kilometers, manifesting countless hands at once—her early technique {Divine Hands of Nirvana}!

CLAAASH!

A heartbeat before Beelzebub’s wretched aura could touch the Demon King, her hands seized the massive body and yanked it toward her in an instant.

“W-WAIT! HEY!”

Beelzebub froze in shock. He certainly didn’t remember her possessing such power.

Worse still, the sheer scale of her Aura forced him to reconsider his approach…

As Anna pulled the Demon King closer while Beelzebub gave furious chase, several notifications flashed before her eyes.

[The Cosmic Throne {Chaotic King of Brutality} says that you don’t have to worry about anything, Beelzebub.]

[The Demonic Throne {The Greed That Consumes Everything} smiles, saying that you will become the recipient of their power, and more.]

“You’re kidding me?!”

Anna gasped at the messages.

Not only was a Void Ruler involved, now two of the most powerful Demonic Constellations had joined the fray?!

“Lucifer…?! The King of all Demons!”

And…

“Mammon, the Archdemon of Greed!”

Both harbored deep grudges against her.

Lucifer despised her for killing his pet, Uroboros.

Mammon loathed her for purging his demonic influence and curse from the chairman.

Somehow, behind the scenes, they had forged a twisted alliance with the Universal Computer, allowing them to cross dimensions as she shattered the barriers.

And Beelzebub—whom Anna had believed dead—was alive all along.

He had returned far stronger, clad in a much more formidable demonic body.

“HEH!”

Beelzebub grinned.

“That’s right! Then give me all your power, you two bastards! If you want me to work efficiently, we have to even the ground!”

FLUOSH!

Anna watched in horror as two streams of cosmic demonic power poured down toward Beelzebub, flooding his form with fresh strength.

He was receiving dual sponsorship from two of the mightiest Demonic Constellations!

“Bastard…!”

She had no time to waste. She touched the still-sealed Demon King—perfectly preserved in a state ideal for what she needed to do.

“All right, it’s now or never… This better freaking work!”

She poured her power into him, activating a skill that turned the white chains around his body pitch black. Demonic energy surged from within him.

FLUOSH!

“I don’t know what you’re trying to do, Anna, but you’re going down now!”

Beelzebub swelled to ten times his original size. Gigantic, muscular, terrifying. Three pairs of wings erupted from his back, and several additional insectoid arms appeared. A cosmic demonic aura radiated from him, rivaling a Constellation itself!

With sponsorship from two of the strongest demonic thrones, his power had clearly risen to match a weaker Constellation.

“Anna! Who is that guy?!”

Song shouted the question as he noticed two more purple-and-red cracks spreading in the distance. Portals were slowly forming within them.

“A Demon from another world! A very bad one that caused massive damage to my own world… Somehow he followed me all the way here!”

“What?!”

“I’m just as shocked…!”

“RAAAAHHH!”

Beelzebub reached them in an instant. His six gigantic claws descended, wreathed in demonic cosmic flames.

“I won’t let you touch her!”

Song charged forward. His powerful claws clashed against Beelzebub’s, intercepting the blows. He spread his wings and unleashed a barrage of feather projectiles.

CLASH! CLASH! CLASH!

“Tch, quite strong, aren’t you?!”

Beelzebub gritted his jaws in fury, realizing Anna had gained yet another formidable ally.

“But not enough.”

He smiled viciously. His aura split into hundreds of ten-meter-long giant flies that swarmed Song’s entire body.

“Uuaaggh!”

As Song panicked, Beelzebub raised and lowered his hand, conjuring a devastating spell.

“{Purgatory Coffin}!”

TRUUUMM!!!

The flies merged into a massive black coffin, sealing Song inside. His power was completely suppressed, his aura devoured by Beelzebub’s energy.

“Thank you for the meal, hahaha!”

“SONG!”

Anna’s heart sank. She turned back to the Demon King.

“Come on, come on, come on!”

As she poured everything she had into him, the Demon King’s will…

Could not resist her own.

FLAAASH!

Without warning, his body vanished into a purple-and-red portal.

Then his entire form glowed as he reappeared within the Purgatory.

The seals fused into his body, empowering him even more.

At the same moment, an unbreakable bond formed between the Demon King and Anna.

“WHERE DID YOU BRING MY NEW BODY?! GIVE IT BACK TO ME! THEY PROMISED I WOULD BECOME A DEMON KING! GIVE IT BACK, BRAT!”

Beelzebub loomed above her, his power now thousands of times greater than before!

He swung his enormous black claws toward Anna.

Yet… she smiled with unshakable confidence.

“Demon King of Destruction. I order you! Protect me.”

RUMBLE!

“GUH?!”

Beelzebub felt his insectoid head crushed as a massive black mechanical arm smashed into him, hurling him away in a gigantic explosion of cosmic demonic energy that erupted into flames and engulfed him.

BOOOMMM!!!

Anna stood tall, smiling confidently as disbelief flooded Beelzebub’s eyes. Even after everything, he had failed to claim the body before her.

“I-IMPOSSIBLE! YOU…?! YOU SOMEHOW…! WHAT?!”

The Demon stood dumbfounded. Anna had transported the Demon King into her Purgatory Realm and turned him into one of her “friends”!

When she summoned him back, he already obeyed her every command.

At the same time, notifications appeared beside her.

Ding!

[You have used the Skill [Divine Demon-Sealing Purgatory Realm] on the [Fifth Demon King of Destruction: Nameless]!]

[You have successfully sealed the [Fifth Demon King of Destruction: Nameless] inside your Purgatory Realm, turning him into a permanent resident of this prison.]

[The [Fifth Demon King of Destruction: Nameless] will now obey every one of your commands.]

[The [Fifth Demon King of Destruction: Nameless] has no name; do you wish to grant him a name?]

[Naming a Demon might increase their power proportional to your own Cosmic and Demonic Powers.]

“He’s my friend now,” Anna declared with a smile. “His name is Nemesis.”

Against all odds, Anna had secured an incredibly powerful new ally.

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