The Protagonist's Sister Is Actually The Strongest

Anna fused several Skills, the power of her Constellations, and even the fragments of the White Tiger Machine’s Cosmic Metal and even a fragment of its crystalized core, which she had pierced through beforehand.

It was a very small piece, something that would have been easy to miss by the King of Steel. However, not for Anna. She had always used the power of her foes against them before, and this wasn’t the exception.

This very fragment was what shaped her new Skill into what it had become, the last essence of these heroes that were betrayed by their own mechanical companions.

It still lived within the cores they stole from them, and Anna was now embodying their last hope, their last dream.

[You have activated the Fusion Skill: [Mighty Morphin Mechanical Armor: Four Cosmic Golden Beasts of Hope (SSS): Lv1]!]

[All of your Equipment such as Armor, Accessories, Helmet, Gloves, and also your Weapons, Swords, Shields, and everything else that is catalogued as Equipment has temporarily merged, becoming the {Mighty Morphin Mechanical Armor of the Four Cosmic Golden Beasts of Hope}!]

[Their Stats have converged into this single piece of armor covering your entire body, and their combined Stats have been further boosted by 400%.]

[Additionally, your Armor will continuously grow on its Toughness, Defenses, Attack and Agility Boost, and Energy-Channeling Capabilities the More Damage it Takes, each direct blow increasing this boost by 1%.]

[You have additionally gained the ability to summon powerful pieces of equipment through the {Mighty Morphin Weapon Manifestation} Ability, which will contain the power of your Weapons combined together, with unique effects and powers based on each of the Four Golden Beasts.]

[The {Four Blessings of the Golden Beasts of Hope} have been activated in quick succession!]

[The {Blessing of the Golden White Tiger} increases your Physical Prowess by 500%.]

[The {Blessing of the Golden Cosmic Millipede} increases your Defense Piercing Power by 250%.]

[The {Blessing of the Golden Sunshine Cat} increases your Agility, Dexterity, and Movement Speed by 300%.]

[The {Blessing of the Golden Nine-Tailed Black Fox} increases your Magical Prowess by 500%.]

[All Blessings are in Effect for as long as the Armor is activated.]

[The Armor is continuously draining Ki and Cosmic Energy…]

Countless messages appeared before Anna, but her eyes were focused on her target; with a single ascending slash of her new Katana, the Aurora Blade was no more, shattering into pieces before the flabbergasted eyes of the King of Steel.

“{Mighty Morphin Weapon Manifestation}: {Golden Tiger’s Katana}”

SLAAASH!

Crack, crack…!

CRASH!

“WHAT?! T-THE AURORA BLADE!”

The King of Steel screamed pathetically as he saw the massive sword overflowing with rainbow cosmic flames shattering into pieces and fall apart. Its power is rapidly beginning to dissipate.

It was so surprising because this Constellation had used such a sword to even split a planet in two once, a planet full of unruly beings that dared to go against the Machine Expansion until the last day.

To set an example, he had used this massive sword, which was designed to fight against evildoers and protect humanity against mortals.

Created to protect the innocent, they ended up using these weapons and powers to torment them…

“My sword…! This is impossible! IMPOSSIBLE!”

The King of Steel screamed as he suddenly manifested a giant rainbow spear, thrusting it against Anna with all his cosmic metallic power.

“{Aurora Lance}!DIE!”

Anna saw the gigantic, over one-hundred-meter weapon rushing towards her, a weapon capable of piercing through the crust of a planet and splitting continents apart.

Her eyes shone with golden light as the core within her armor overflowed with the energies of her own Myriad Self Arts Aura, making the armor glow with rainbow-colored circuits through its golden metallic exterior.

“Anna…”

And she heard the voice of a young man.

“We’re with you!”

And then of a woman.

“Please… Defeat the King of Steel!”

And then she heard another man.

“It is our fault that things turned out like this…”

Another woman spoke.

“So we will give you what remains of our power, our wills… Please, defeat him and end this nightmare!”

Anna felt their hands touching her shoulders, and as she glanced behind her, her Myriad Self Aura transformed into five faint figures of various colors.

Their faces or appearances were no longer visible, but she immediately knew who they were.

“The Rainbow Knights…”

Anna shed a tear, the power of Empathy within her amplifying her own emotions even more than before, as she felt their pain and agony through all these eons, trapped within that mechanical abomination.

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If there was something in common between her two lives, it was that in both, Anna always enjoyed these types of shows. Although some kids would tell her they were dumb and that she had to grow out of them because of how ridiculous they were…

She would simply get angry and not talk with that kid again.

To her, these colorful heroes were more than just action and show; they were more than just cheap special effects and actors nobody knew.

They embodied hope and the relentless human spirit to fight against all odds, no matter how crazy they could be.

“It’s a bit sad that I got to know you guys were real somewhere when you were already dead…” She sighed, as the figures seemed slightly surprised. “But I want to tell you that you were always my heroes.”

“…”

“…”

“…”

“…”

“…”

As the spear descended rapidly, the heroes remained in silence, moved by her words.

And then they nodded.

“Thank you, Anna…” The Red Figure said.

“Our powers are yours!” The Yellow Figure nodded.

“Please… protect the innocent people caught up in all this destruction…” The Blue Figure said.

“Take it all!” The Black Figure said.

“We were unable to save them… Our world… But at the very least, we know that with you, this will finally have closure.” The White Figure said.

Their eyes shone brightly as they became Spirits, fusing into Anna’s Myriad Self Aura, their forms becoming clearer.

And then Anna nodded, rushing upwards.

Enormous blazing wings manifested from her armor, shaped like those of the Red Phoenix.

“No matter what you do, you will never achieve the authentic power that you had when your heart became one with them, King of Steel!”

With those words, Anna swung the Katana upwards, a single slash that moved towards the skies.

SLAAASH!

A massive slashing wave of golden light manifested, clashing against the lance’s rainbow flame-covered blade.

CRAAASH!

The power alone was tremendous, yet the King of Steel infused more power into his weapon this time, reinforcing its durability.

“This time you won’t destroy my weapon so easily!”

The King of Steel smiled with his metallic teeth as his thrusting blows became faster and faster, trying to push Anna to her limits and then impale her entire body, leaving nothing but holes!

Anna swung her Katana, clashing against him with all her strength, explosions of rainbow flames and golden light erupted everywhere across her Domain.

CLASH! CLASH! CLASH! CLASH!

“Ngh?!”

The King of Steel quickly realized something, though: the more he hit Anna…

The stronger and faster she was becoming!

She was purposely letting that massive spear hit her armor, which didn’t even scratch its surface at all.

“What in the world…?! Not even the armor of the original Rainbow Knights was this tough! You’re cheating! This is unfair! UNFAIR! UNFAIR! UNFAIRRRRR!”

The King of Steel raged, furious that Anna had gained such unfair power, despite him being a Constellation coming after a mortal.

Wasn’t that unfair already?

“For a robot, you’re just the same as humans, aren’t you? And a big crybaby at that!”

Anna appeared before the King of Steel’s face, his metallic lips opening as he gasped.

“W-Wha…?! So fast!”

Anna’s Aura exploded as the five colorful silhouettes emerged, transforming into the spiritual forms of the beasts they embodied.

“I brought some friends; how about a quick reunion?!”

“Eh?! Impossible!”

As the King of Steel continued reacting with utter disbelief, the five colorful spiritual beasts descended, attacking him with powerful blows, explosions of various colors engulfing him, and metallic pieces shattering and flying all over the place.

“King of Steel! You’ve destroyed enough!”

BOOOM!

“Your reign of terror ends now!”

BOOOM!

“For old times’ sake, please, stop this already!”

BOOOM!

“You weren’t like this! You were our friend!”

BOOOM!

“Enough is enough!”

BOOOM!

“Nnngggh?! Y-You dare bring them back? Are you a Necromancer or something?!”

“Well, actually, kind of.”

Anna rushed forward; with her golden katana, she slashed through the King of Steel’s right hand as his Aurora Lance was dropped onto the floor of her domain!

CRAAASH!

“ARGH! COME BACK, AURORA LANCE!”

As he called his weapon back, his metallic wounds began to regenerate, light rapidly becoming steel to reforge his body together to perfect condition.

This was a natural ability these Machines possessed, fueled through the power of the Morphin Cores, which possessed near-endless quantities of powerful energies.

And yet…!

“You want this?!”

Sepa emerged from the Domain’s Floor, wrapping her body around the Aurora Lance before reaching the King of Steel and…!

Crack, crack…!

CRASH!

“No! Another weapon gone already?!”

The Aurora Lance shattered into pieces, as its fragments fueled the Domain, making it stronger the same way the Aurora Blade did.

“Did you notice something different too?!”

As Anna asked, her Aura transformed, wrapping around her fists, as her armor merged with it, becoming a pair of gigantic fists with sharp cat claws.

“{Mighty Morphin Weapon Manifestation}: {Golden Sunlight Cat’s Paws}”

With the massive metallic paw-shaped gauntlets, Anna unleashed a barrage of punches towards the King of Steel’s joints.

She aimed at his left and right shoulders, trying to shatter them so he would lose his arms next; she wasn’t aiming at the head because she knew it wasn’t a vital spot.

Robots were different than organic, living beings whose heads were usually a weak point, and this being was also a Constellation!

Therefore, Anna aimed to separate the King of Steel back to its divided form and destroy him through these means.

CLASH! CLASH! CLASH! CLASH!

“UUGGH…! AARRGH!”

The King of Steel kept fighting back, manifesting an Aurora Shield to defend, but even the shield began gaining cracks, ultimately…

CRAAASH!

Shattering as well!

“NO!”

The King of Steel manifested giant cannons from his shoulders, firing two beams of rainbow cosmic energies against Anna.

Anna smiled.

“Your shield was pretty bad! Want to see one that’s good, though?”

As she smiled, her hands came together, and suddenly…

“{Mighty Morphin Weapon Manifestation}: {Golden Cosmic Millipede Shield}”

FLUOSH!

A massive millipede quickly wrapped itself together into a large, golden, and rainbow-colored shield, taking both beams at once.

BOOOM! BOOOM!

The explosions were massive, capable of pulverizing mountains with ease; Anna was pushed back greatly.

And yet…!

“We’re here with you!”

“Anna! You can do it!”

“We believe in your strength!”

“And we believe in your heart!”

“Use our power to stop him!”

The Five Rainbow Knights appeared behind her once more, their powers merging with her shield, making it mightier, stronger, and bigger!

TRUUUM!

And then, a massive golden dragon head emerged from the mechanical shield, opening its jaws and devouring both of the King of Steel’s beams at once.

And immediately after, firing their power back at once, a rainbow-colored cannon pierced through the King of Steel’s left shoulder!

“Wha…?!”

BOOOMMM!!!

The Qilin Arm was immediately separated, and while half of the Qilin’s body was pulverized, its mechanical interior could be seen from within, alongside its shattered Morphin Core.

“No! C-Come back!”

The King of Steel despaired, pointing his other hand to the Qilin Robot to merge back with him and recover.

And yet…

“Huh?!”

He realized slightly too late that he didn’t even have more hands; the White Tiger’s hand had been cleaved off by Anna just a few seconds before after all.

“Why… Am I not regenerating?!”

He was shocked, as the dark ember of despair started to emerge within the very heart of the King of Steel, his mechanical eyes glaring at Anna.

“Took you long enough…” Anna smiled, her long hair waving by the wind. “Each of my blows has been sealing away more of your power. All thanks to the heroes you antagonized and slaughtered.”

“T-That’s…! Impossible! S-Since when did they even have such power?!”

The King of Steel grew nervous, furious, and… afraid, as he saw the five figures of his former masters appear behind Anna.

“Impossible or not, I made it possible,” Anna said. “And your death… is already a fact.”

“Y-You…!”

The King of Steel started growing desperate; his body was already in shambles.

“I WON’T DIE HERE!”

CLANK!

His chest opened, revealing something bizarre…

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