*3rd Person's POV*

7 years earlier

you were born in a powerful clan the Uchihas, you have three siblings one brother, two sisters, you are second to the youngest, before Yukihime Uchiha or you like to call her Yuki, who admires you the most all of the members of your massive clan are a peace loving nature, but all of the members have an incredibly powerful ability hidden in the eyes and soul that is hereditary, the eyes that reflect the heart 'the Sharingan', and the soul that is your spirit guardian called the 'Zanpakuto' or the reapers sword, the empire saw your clan as a threat and dispatch Najenda to eliminate your clan, First she has to gain your trust.

Day by day she gains your trust but at the same time she thinks that you are no threat to anyone, then she saw you training with your family, that's when she realize that the powers you all possess red eyes that can perform amazing feats, and a mysterious skills that can manipulate elements, but eventually she is not capable for only an Uchiha can have these feats

she is now watching you train you are in the middle of the targets for target practice you jumped up into the air and started spinning and throwing kunais everywhere and use others to redirect their directions, once you landed all of the kunais have hit their target precisely which made Najenda look in shock

Yuki: Onii-Chan you're amazing you hit every target even the blind spot behind the rock, yosh now it's my turn

[Y/N]: Yuki, it's about time we head back

Yuki:  you promise that you would teach me shuriken jutsu today and teach me how to control my zanpakuto Sode no Shirayuki

[Y/N]: I have an important mission tomorrow, so i better get prepared

Yuki: you're a liar Onii-chan

[Y/N]: *Scoffs and gesture to come* I'm sorry Yuki maybe next time *pokes her forehead*

Yuki: Onii-chan watch me

[Y/N]: o-oi! don't be reckless..

with that she scraped her knee which made you carry her back with a piggyback ride, that's when you bumped into Najenda

[Y/N]: oh ms. Najenda, how are you today?

Najenda: I'm fine thank you

[Y/N]: well, we'll be off

Najenda: wait!!

[Y/N]: what is it?

Najenda: I have to tell you something... the... empire sent me to eliminate your clan

[Y/N]: *wide eye* why? why would you keep such a secret from us?

Najenda: I never meant to keep it, I won't ask for your forgiveness, you can kill me now for being with the empire.

she expected him to kill her but what he did she did not expect he hug her as well as his little sister

[Y/N]: it's alright, we know you're reasons are good enough... let's go warn everyone in the village

Najenda: yeah, let's

they went back to the village but much to their horror the village is covered in ice and everyone has been murdered even his family and they saw a sight of a person and her army

Najenda: [Y/N] go and hide somewhere

[Y/N]: but-

Najenda: don' t worry about me, keep yourselves hidden

With that he cloak himself and the woman went to Najenda

Woman: well, well, well, I thought they killed you.

Najenda: no Esdeath, I got a little sidetrack with many danger beast

Esdeath: very well, let's go back to the capital and report to the prime minister that our objective is complete

Najenda: okay 'please be safe [Y/N] Yuki'

When the army is nowhere out of sight the two remaining Uchihas look in horror and sorrow when Yuki and [Y/N] look at each other they noticed that their sharingan has change

Yuki: this must be the legendary mangekyo sharingan

[Y/N]: it is but if we use it too often we will turn blind

Yuki: then let's transplant our sharingan to each other to gain eternal sight

With that the two siblings begin the operation which was a complete success now they gained eternal mangekyo and everyday they trained their mind and body to master both of their sharingans and zanpakuto and eventually they learned their bankai and one thought that the two of them share 'I must destroy the empire even if it's the last thing I do'

2 years earlier

The two of you are on a bounty mission to kill an ultra-class danger beast which is rewarded 10,000,000 gold it is rumored that this danger beast can even rival the best bounty hunter, you two have imperial arms but, you only use it if the situation calls for it, you two have more than enough equipment to kill this danger beast, you wield a sword named 'kusanagi' while your baby sister wield a lance you are known as the shadow assassin and you sister is known as the snow assassin considering she can kill efficiently even in the snow, the empire feared both of you because of all your kills you even killed one of the most powerful commander easily.

You two are now at the destination of this danger beast you sneaked behind it but your out of luck because it sense your presence because of a twig breaking it then send out a massive range of attacks

[Y/N]: Fire style: Fire ball jutsu

Yuki: Wind style: Swirling vortex Jutsu

Your fire combined with her wind created a massive fire tornado and engulf the danger beast, but it was barely affected by that attack.

[Y/N]: it's tough *closes eyes and it bleed* Amaterasu

Now it is engulf by black flames but it's still not good enough to kill it, you then close your eyes and the black flames disappear but out of the blue it grabbed Yuki

[Y/N]: YUKI!!!

Yuki: ONII-CHAN!!!!

You charged at the danger beast in an attempt to save your little sister but it just swats you away and it punch Yuki with so much force she coughs up blood you gasp in horror and went wide eye

Yuki: onii.... Chan

[Y/N]: YUKI!!!

You then rush to you dying baby sister who is in her final moments

[Y/N]: Yuki!!

Yuki: onii... Chan... Thank you... For... T.…. Taking... C.... Ca... Care ... Of... Me

[Y/N]: *trembling voice* don't waste your energy speaking Yuki I gotta use medical Ninjutsu on you *tears*

Yuki: it's... No ... Use... Any... More... M.... M... My... Body... Is... Feeling.... H.... Heavy

[Y/N]: *trembling voice and tearing up* No I don't wanna lose you, I don't want you to die!! You're the only family I have left

Yuki: .... Don't blame.... Y.…. Your... S... Self... Do….. Don't... W... Worry about me..*wipe away your tears with her hand*... I will always... Be with... You... Be... Because…. You... Have... A.... P.... Part of.... Me... With... You... N... Now.... I... Can.... J.... Jo... Join e.... Eve....ry....one... I... L... Lo.... Love... Y... You... O.... Onii.... Chan.... I.... A... Al.... Ways.... Will

[Y/N]: *sobbing* I Love You Too my sweet baby sister!!!

With that she breath her last you are mourning her death then a blue flame surround you and soon turned into a warrior then the danger beast charges at you but you quickly sliced it in half easily after that you mourn your little sister's death, you then collect the bounty and go back to your little sister and give her a proper burial.

[Y/N]: *Yuki's voice in mind* 'I will always... Be with... You... Be... Because…. You... Have... A.... P.... Part of.... Me... With... You... I... L... Lo.... Love... Y... You... O.... Onii.... Chan.... I.... A... Al.... Ways.... Will' *tear up* I promise you Yuki that I will bring an end to the empire's Tyranny all of you are now watching over me and guide me throughout this path that I've chosen, this time I will defeat them.