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Mushoku Tensei: Reincarnated as the Twin Sister of Rudeus Greyrat

The story is about a teenage girl who run away from home because of so much abuse, and then met someone who considered as her kindred spirit. They both died together and reincarnated as fraternal twins, or is it? Watch as Rebecca travels the world to uncover the secret of the ancient past and reveal the real truth of her reincarnation. Note: English is my 2nd language. I may know how to write English but I have some difficulties with writing in English. So, forgive me for the terrible grammars that I might write in the fanfic. Please correct me properly if you want but don' t severely bash me if I make mistakes. Note # 2: This fanfic is a mixture of various anime and games. This includes Mushoku Tensei as its foundation, mix with Sword Art Online, Honkai Impact and Genshin Impact. I might add other more references in the future as well. Update: The artwork isn't mine but I will use it anyway because Rebecca looks like her

TempestNotion · Anime & Comics
Not enough ratings
30 Chs

You Kidnapped the Wrong Child, You Fool

[Rebecca POV]

"Urgh, my head.... Where am I?" I muttered as I woke up with terrible pain at the back of my head.

I looked around to assess my surroundings.

It seems I am inside a dungeon of some sort. The room I am in was dingy and a bit messy.

There's a lot of used armor and rusty weapons.

"Why am I here? What the heck is this place?"

I then pan my view on the corner of the room. There, I saw my [Night Sky Sword] resting on a wall.

"My sword!"

*clank* *clank*

"Eh? What the hell is this?!" I was about to get up and get my sword, but I was shocked that I couldn't move my body.

I panicked and quickly look at myself. I realized that hands and feet are tied to the wall with iron cuffs and chains.

I tried to use battle aura to break out of my restraints but it won't budge even if I struggled even more.

I assess the problem and saw that there are magic stones are embedded on each of the cuffs on each of my limbs.

I assume that these magic stones are responsible for negating the usage of my battle aura and my physical strength.

"Now what do I do?"

"....."

"How the hell did I end up in this situation again?" I questioned myself as I tried to remember what happened before this.

*Start flashback SFX*

--------------------------------------------------------

[Several Hours Ago]

It's been few days since me and onii-chan arrived in Roa.

During those few days, we continued on our sword training while waiting for onii-chan's plan to begin.

As for now, nothing much has happened other than being trained by Ghislaine.

Speaking of Ghislaine, she's a great teacher just like how father described in the letter.

She doesn't talk much unless it is an advice or pointers to remember during sword training.

Her terminology is not that great since she's not used to human language that much.

However, her demonstrations are on point and I learned a lot from her.

Especially the one technique that is crucial for my progress in ascending to greater ranks.

"Longsword of Light? What's that?" I asked Ghislaine when she told me on what to do in order to ascend to saint rank.

"Yeah, Ghislaine. What is the Longsword of Light?" Eris also asked since she's with me in the sword training.

"It is the ultimate technique of the sword god style" she briefly defines the technique to us.

"Oh? Then can you show us how to execute the technique, Ghislaine?"

"Yeah Ghislaine, show us"

She nodded and unsheathes the sword on her waist.

We take several steps back to avoid getting hit by a real sword and watch Ghislaine from afar.

She holds the sword steadily with both hands and raise it up above her head.

Then....

*WHOOSH*

Ghislaine swings her sword downward with great force that her whole arm blurs when she strikes.

""Woah!"" me and Eris look at the scene with awe and wonder.

As the name of the technique described, the sword swing Ghislaine demonstrated actually reached the speed of light.

"It's so cool! I want to try it" I then rush to the weapon rack and grabbed a wooden sword.

I then went to the middle of the courtyard and take a stance.

I tried to remember the demonstration Ghislaine did earlier and attempt to execute the technique.

'Okay, hold the sword with both hand and then raise the sword upward'

I then gathered all of my strength and applied battle aura to my arms.

And then...

"HAAAH!!"

*....*

My both of my arms and the wooden sword blurred as I swung downward.

The swing is silent and doesn't seem to make any sound.

*pant* *pant*

I pant heavily as my arm went numb from the swing I made.

I then look at Ghislaine who was watching me.

"How's that Ghislaine. did I do it?"

I asked Ghislaine if I succeed but she shook her head.

"Still a little bit slow, that's just [Longsword of Silence]"

"Hah! Don't get conceited, brat. You can't just learn the technique in your first try"

Feeling down about their answer, I frowned and I droop my shoulder while looking down to the floor.

'I failed, huh? Perhaps I am not strong or fast enough to do it, am I?'

While I am contemplating on my weaknesses, someone grabbed my shoulders.

I looked up and saw Ghislaine's gentle expression while kneeling in front of me.

"Don't feel bad. You will able to do the technique someday."

"..."

"You just need to be a little bit faster than before"

Ghislaine tries to reassure me but I reluctantly nodded. She smiled wryly to my action and patted my head.

"Long time ago, when I was just young girl, my father used to tell me stories of the past"

"What are those stories about?"

"400 years ago, there was a time when the legendary [Warrior God] persuaded the Beast race to join them in the battle of the Human-Demon war. The Warrior God promised that they will protect the Great Forest in exchange for their allegiance "

"Eh? Who's the Warrior God" I asked Ghislaine when I the story caught my attention.

"The Warrior God goes by many names. The human race called them the [Wandering Heaven Race] and the demon race called them the [Bane of the Demon Race], but we beast race refers the Warrior God as the [Heavenly Protector of the Great Forest]."

"Then, why are you telling me all of these?"

"Because the Warrior God taught the beast race one valuable lesson during their time in the human-demon war"

"And what is that?"

"[Work harder when your progress is stagnated,

Act better when your actions seem incompetent,

Think faster when your thoughts are delayed,

Get stronger when you feel you're the weakest.

Those were the four crucial components on achieving success. ]

I didn't know what those meant but I'd like to say these to you"

"I see..."

'I understand now. Those words made a bit of sense if you think about it, so I understand what these lines mean'

"..."

'Wait a minute... did the Warrior God just....'

"Oh my, what do we have here?" I heard a voice behind me, so I turn around to see where it came from.

It was Philip-sama and he is walking towards us along with onii-chan and Thomas.

"Ah, Philip-sama. What brings you here?" Ghislaine let go of my shoulders and stood up.

"It's nothing in particular, I'd like for Rudeus, Rebecca and Eris to go outside and have a nice walk to the city." Philip-sama explains the reason being here.

'Oh right, Onii-chan's plan'

"Huh?! Why do I have to come with these two brats anyway?" Eris protests to Philip-sama in utter denial.

"Erm, Eris dear, Rudeus have thought of showing you.... uhh... new stores in the citadel." Philip-sama tried to convince Eris with excuse to come with us outside. Eris, however, doesn't seem convinced and just snorted.

'Wow, great job convincing this lady jerk, Philip-sama. How about make a more convincing excuse next time'

While I'm jeering Eris and Philip within my mind, onii-chan steps forward and tries his turn to convince Eris.

"Hey Eris. How about we bring Ghislaine along, will you come with us?" It took Eris few minutes of reconsideration before nodding reluctantly.

"Urgh, fine! This better not be a waste of my time, hmph" she then turns around and walks away

We all looked at each other and nodded to signify that the plan is precedingly smoothly.

Me, onii-chan and Ghislaine followed Eris who reprimanded us for walking so slow.

*End flashback SFX*

---------------------------------------------------

[Back to the Present]

Wait. Why did my flashback end there? Where's the rest of it?

Does the pain on the back of head has something to do with this? From what I can assume from the pain I am feeling, I can say that we got bonked at the back of our head by surprised.

But, where's Ghislaine in this scenario? Was she supposed to be with us.

Also, speaking of us.... Where is everyone?!

I looked at the room the second time to double check and I found nobody in this room.

"Onii-chan?! Eris?! Ghislaine?! Are you guys here?!"

When I tried to call out to them if they were somewhere in this building. However, no one answered my calls which made me anxious.

"Hello?! Anyone home?!"

"...."

"It would be much appreciated if someone come over here and help me out here."

"..."

Hey! My back is itchy, can someone scratch it for me"

"....."

"How many kidnapped children does it takes to change a lightbulb? Oh wait, lightbulbs weren't invented here yet. Nevermind!"

"...."

"CHALA HEAD CHAL-"

*SLAM*

"Shut the hell up, you brat!"

"Urgh, finally"

Due to my constant nagging, someone finally came in the room.

It is some thug with long blonde shaggy hair and scruffy beard. He seems to be wearing very ragged swordsman outfit and he has an average longsword strapped on his back.

From what I can tell from his appearance, he is somewhat on the rank of advance of saint swordsman.

'Okay, Rebecca, think. What do a damsel in distress would do in this situation?'

"Ahem~ Hello there handsome~ Would you mind if you get these cuffs off me. You see, my hands are getting tired from being suspended on the wall." I smugly teased the thug and asked him a favor to let me down.

*Slap*

He then slaps me across the face, which stings due to me unable to use my battle aura because of these weird cuffs on my limbs.

"Ow, that hurts you know. I could take that slap as a no then" I irritably said as I frown at the man.

"Shut up!" he angrily yells at me but I only made a deadpan expression.

He snorted as he turns around and walks away from me.

"Hmph, looks like someone has a terrible anger issue" I murmured to myself, but I purposely made it loud enough for him to hear it.

The then turns around with veins popping out of his forehead. The grumpily strides back to my location and winds a punch.

"That's enough, Belmond" another voice calls out from the other side of the doorway.

Then a rich looking noble man with blond hair and green eyes comes inside the room.

"Leave this girl to me and guard the other prisoner instead" The noble man ordered the blond thug and he complied grumpily.

'Another prisoner? could it be onii-chan or Eris?'

"Tch, whatever" he sneered angrily and walks away from us.

*SLAM*

As I am contemplating on what the nobleman said, the door slamming snaps me out of my pondering.

"You must be Rebecca Greyrat. I have heard from Thomas that you are a very skilled swordswoman" the nobleman then starts the conversation as he walks towards me.

'Thomas, huh? So he is probably a traitor all along'

" Thanks for the flattery, but who are you?" I asked for the nobleman's Identity.

"Ah, my apologies. My name is Otto A. Silva Ganius, the cousin of the prime minister of Asura. I am the one who ordered to kidnap you" the blond nobleman introduced himself and I nodded in understanding.

"Then may I ask why did you order them to capture me specifically?" I inquired for information on the purpose of the kidnapping, now that I realized it is no longer a pretend kidnap.

"It's because you are my test subject, my dear" he said as he walks to a table on the corner of the room and picks up a syringe filled with purple liquid.

"Eh?! Why me?! Also, what is that?!" I panickily asked as I saw the needle on his hand.

"You see, my cousin informed me that his god told him about secret that you are hiding within your whole being. And also, this is sedation fluid, my dear." he cryptically told me his purpose, which made me confused and terrified.

"Wait? What secret are you talking about?! Hey! stay away from me!" I angrily yell at him as fearfully watch him pointing his syringe to my arm. I struggled my hardest to get away from him but the cuff restricts my movement.

"It's no use struggling, dear. Those cuffs I invented prevents the flow of battle aura from flowing and it weakens your muscle as well. So, just relax and go to sleep. Besides...."

He then moves his mouth next to my ear and silently whispers.

"There's an ancient god within you"

"Huh?"

*stab*

"Gyaaaaaaaaah!!"

I screamed in pain as the needle of the syringe sinks into the skin and the content of the syringed flow through my veins. The smiled in glee as he watches me in cry in agony while struggling.

But then....

*Ba dump*

I suddenly felt dizzy and my vision becomes blurry.

My body is feeling numb and sleepy, and struggles becomes lessen.

Eventually, darkness filled my vision and I fainted due to exhaustion.

-----------------------------------------------------

[Third POV]

After Otto sedates Rebecca, she stops struggling and went to sleep.

"Now that phase one is complete. Time to move to phase two." he said as he drops the sedation syringe and picks up an empty one.

"Time to harvest the blood of the heavenly principles" he mutters as he pierces Rebecca's skin with the needle.

As he is about to collect Rebecca's blood, Rebecca immediately opens her eyes, which is glowing yellow.

Otto noticed her waking up and was surprised that the sedation didn't work. He then collects the blood as fast as possible.

*snap*

Rebecca then snaps her finger, materializing a small javelin and telepathically hurled it towards Otto's direction.

"!!"

Otto pulls out the syringe and barely dodged the approaching javalin.

"You dare pierce my vessel's skin, foolish human"

Rebecca then started to speak in a cold and ruthless tone as she menacingly stared at him.

"Heh, you must be the god that Darius is talking about. I never expect you would take over her body" Otto nervously puts the syringe in his coat and backs away from the girl.

"I don't care whoever this Darius person is. I do however, care about you mentioning a god telling him what to do. Is this god you're referring to was the [Human God]? If your answer is yes, I want you to spit out everything about everything that bastard said to that person." Rebecca indifferently inquires, putting frustration and annoyance on the name [Human God].

"Hmph, what if I won't tell you. You can't hurt me from that situation you are in. I specifically modified the magic stones in order to restrict anyone, even a god like you." Otto smugly boasted his invention to Rebecca, which she returns it with her own smug expression. This made Otto feel uneasy about her expression.

"Is that so? Let's see about that" she maliciously grins as she looks at her restraints.

She then starts chanting her magic to the magic stones embedded on the cuffs.

"[Abyssal Tampering Magic]"

*Powering off* *crack* *Shutter*

After chanting her magic, the magic stones lose its colors and Rebecca easily breaks the cuffs on her hands and feet, shattering it to pieces.

"I-impossible!" Otto was utterly shocked and felt mistaken about his previous statement.

"Fufufu, there is nothing impossible in this world that I couldn't conquer. You said it yourself, didn't you? You said to her that there's an ancient god within her"

Rebecca said as she approaching Otto, who was backing away from her.

Eventually, Otto hit a dead-end and hit the wall behind him. Rebecca then stands right in front of him and stared at his anxious eyes.

"I am that god that you're talking about, you insolent mongrel" Rebecca cold-heartedly told Otto a bit of her identity.

"!!" Otto was terrified as he was completely miscalculated in his plan.

Rebecca smiled like a maniac when she saw Otto's horrified expression. She then lifts her hand forward with a snapping gesture.

*snap*

Then a syringe with blood appeared in front of her and she fell on top of her palm.

"W-what!" Otto then checked his coat to see that the syringe he stored was gone and was at Rebecca's palm. "Fascinating..." he could only mutter in ecstasy at Rebecca's hidden godly power.

"Say, what do you plan on using this blood you collected? You humans sure are uncanny with your fancy weapons and invention, I don't know you could invent things like this" Rebecca said as she inspects the syringe.

"You could say that we humans are indigenous when it comes to making things tools to take down any adversaries." Otto said as he lowkey puts his hand to his coat, reaching for something.

"Is that so? What kind adversaries did you humans defeat again?" Rebecca cautiously said as she noticed something was off.

"Oh, you know, adversaries..." he then quickly pulls out a crossbow with an arrow that has a magic stone tip.

"!!"

"Adversaries LIKE YOU!!"

*Pew*

When Otto pulled the trigger of the crossbow, the magic stone arrow flew towards Rebecca.

However, Rebecca just smiled and raised her hand again, preparing to snap.

*snap*

When she snaps her finger, a small black portal appeared in front of her. The arrow went inside the portal, not able to reach Rebecca.

*snap*

She then snaps her finger again, creating another portal. But this time it is pointing at Ott's leg and the arrow that the first portal swallowed, flew out of the other one.

*Thud*

"Grrrgh!"

"Fufufufu"

The arrow then hits Otto at the leg, making him kneel on one foot and grimaces in pain. Rebecca laughs menacingly at Otto's suffering. Then he starts to tremble as he is panicking on something.

"What's wrong, mortal? You seem to be shaken by my retribution." Rebecca smugly mocks Otto for his comeuppance. Otto angrily glared at Rebecca who was crouching in front of him.

"You have any idea, what have you done?" Otto furiously questions Rebecca's consequence, which she only replies with a shrug. "That arrow was poisoned, you bastard"

"What are you talking about, human? I only redirect your arrow back to you. So, if anything, you should blame yourself for firing that arrow. Even if that arrow hits me, I could just detoxify it in just few seconds"

Otto could only sneer in frustration and anxiety. Rebecca giggles in absolute bliss at Otto's suffering.

"So, what is it going to be, human? Should I let you slowly die from the poison, or you will tell me about what are you going to do with this blood you have collected and I will detoxify the poison" Rebecca negotiates with Otto while flaunting the syringe on her hand.

Otto couldn't do anything but to reply with Rebecca's question. He is however, reluctant to say so.

"Come on, mongrel. Time is ticking. You have only 30 more seconds left before die~"

Otto was extremely anxious when Rebecca told him how long he will live. He ponders for his answer and made his decision to answer.

"I.... want a daughter" Otto bluntly answered

"Huh?!"

"A daughter with the same godly powers as you. That... is what I'm going to do with that blood" Otto is resolved to explain to Rebecca his plan.

Rebecca was speechless on Otto answer for a few seconds, before grinning wildly.

"Kukukuhahaha hahahahaha! HAHAHAHAHAHA!" Rebecca then laughs hysterically and sinisterly, as if the devil himself is laughing at Otto.

Rebecca then placed her hand on Otto's shoulder and detoxify the poison as promised while still laughing.

"hahahaha, that's the most hilarious joke I have ever heard. I have never laughed this much for ages" Rebecca cheerfully mocks Otto's plan as she tries to restrain her laughter. This made Otto's brow to twitch in irritation.

"So, are you going to return the syringe to me? I have already told you my plan" Otto demands Rebecca to return the syringe back to him.

"hahahaha.... no"

*crack* *shatter*

Rebecca then crushed the syringe with her barehand, spilling the blood to the floor.

"!!" Otto was shocked when the blood he collected was wasted just like that.

Rebecca then pulled Otto closer, gripping his shoulder tighter.

"Do you think I will just be going to give you my blood so easily just for a mere daughter? If so, you are gravely mistaken, human."

Rebecca then grabs Otto lapel and stared at him with her golden yellow eyes. After that, she winds up a punch and Otto tried to defend himself. However, it was too late and Rebecca punched him in the face.

*Pow*

"I won't let some cheap copy of me roaming around the world..."

*Pow*

"While I am stuck in my own personal HELL..."

*Pow*

"Down in that endless white void..."

*Pow*

"Along with that shitty *pow* insolent, *pow* contemptuous, *pow* audacious *pow* annoying *pow* WHITE BASTARD!"

*POW*

With the last punch Rebecca delivered, Otto was knocked out with multiple bruises all over his face.

"!!" Rebecca then realized what she had done and quickly healed his face, as well as removed a bit of his memories for good measures.

She then carefully put Otto down to the floor and quickly contemplated her actions.

'Okay, that went out of hand on my part. I should calm down before lose myself again to that bastard Human God. He had already done so much damage to ruin my life in the past and I will not let it happen again.

Now that I found a suitable vessel to command, I began my plan in breaking out of my prison in the Void world. It might take Rebecca a while to grow her battle aura but if Rudeus succeed on winning Eris trust, then Rebecca will continue her sword training with Ghislaine.

As for me, I shall stay low for now and avoid getting detected by the apostles. Though, he may have already noticed me inside Rebecca's body because of that Darius person, but he doesn't know what I am planning. Luckily, I already tampered his future sight long time ago, so he could not see my future as well as Rebecca's.

So, it will be a matter of time until I will be free from my eternal damnation... and murder that white piece of shit. I don't care if this world will collapse on itself if I kill him. As long as he is dead, all of the hardships and suffering I have seen in the past, will finally be rest in peace.

Especially the man that I used to love and care. He will be free from his crazed and unstable state once everything is over and we will be together again.

Laplace, just wait for me...'

"......"

After Rebecca is done contemplating, she stood up and brush off the dirt on her knees and fixed her clothes. She then picks up the sword on the corner of the and strapped it on her back.

'I guess my job here is done. I hope Rebecca will not freak out once I wake her up.'

*Ba dump*

-------------------------------------------------

Hello there, Author-san here.

Sorry for the long delay, I have school works and quizzes that messes with my writing schedule.

So, forgive my tardiness.

Anyway, this is the new version of the chapter: Operation [Getting Kidnapped] begins.

I made a huge change on the characters involved.

I replaced Darius with another character because it would ruin the plot if he were to be one getting beat up by Rebecca's mysterious alter ego. Plus, it would be dumb of him to be the one confronting Rebecca and it's better if he is the one pulling the strings behind the shadows.

Also, the character Otto is not exactly the same Otto from the Honkai game, though his looks and demeaner are similar. His goals are different as well, but the methods are bit similar as well.

Lastly, Rebecca's alter ego origin is leaked a little. So, enjoy theorizing your own interpretation of her backstory. [BUT NO SPOILERS] I don't like people taking the words out of my mouth when they type their theory out loud. So, be vague about it.

That's all of the things I have to say and I hoped you enjoyed the chapter.

Peace~

Time for plot to thicken

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