First time writing so go easy on me, please point out any grammatical errors i make in the writings , and i hope you enjoy the stuff im about to create lol)
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... "clang" ....."clang".... CRASH!!!!

Y/n was kicked through a wall and lost his katana when he hit the ground, with a grunt he lifted himself up with one arm and got a look at his attacker

Mifune... The Leader of the Most infamous yakuza gang in japan...and his master...

Mifune: "Out of everyone under my ranks....i never thought you would be the one betray us y/n..."

Mifune Dashed Towards Him, y/n just barely managed to dodge by rolling away, He made the mistake of underestimating Mifune, he may be an old man but there was a reason he had control over the yakuza with an iron grip for years, his sword was still out of reach, this wasn't looking good.

Mifune: "I gave you everything! I fed you, Trained you, Gave You Power, How could you betray your Family?!!"

Y/N: "Family?! THIS IS WHAT YOU CALL FAMILY?!"

Mifune went on the offensive again, jabbing his sword at y/n torso, but y/n shifted to the side and kicked Mifune, Mifune remained on his feet as the Armor he had on absorbed the Blow

Y/n: "You slaughtered My Family, Made Me think they threw me away, i had to bare witness to this gang causing nothing but pain and suffering to innocent people, watched as you all drank and laughed at everything we did, You were never my family and i only regret not being able to break away sooner..!" He growled in anger trying to focus it and not lose himself to it.

Mifune gripped his Katana: "We took care of you, your family had nothing to their name, just that damn sword, i saw a better way, if i had left you there you would just been another victim of poverty! "

Mifune stretched out his arms at the now destroyed interior of their Home Base

and now look at what you have done... Our Halls, drenched in the blood of your brothers....Can you honestly look me in the eyes and say you feel no remorse for this destruction.....or for what you did to your brothers..."

Y/n closed his eyes at the words, he would be lying if he said at one point he did consider many of his fellow yakuza brothers....but then he truly saw them for what they were...

the beatings they put on families....The damn smiles they had whenever they crippled families financially or the lack of remorse many of them had throwing bodies in rivers.....they were children in those body bags....

So when he finally decided to strike he did not hesitate, there was even some he hoped to spare , so that they could see the damage they had done and just maybe they could give up this life.... It was too much to hope for.....

Y/n opened his eyes and looked mifune in the eyes: "...Not even a little bit."

Mifune glared at him, he then walked over to y/n sword and kicked it at him

Y/n caught the blade and raised an eyebrow at his former master

Mifune: "There is no pleasure in killing an unarmed opponent,  Let us see if you have what it takes to kill me boy."

Y/n:  "Hmph".  Y/n  gripped Sento and entered a comfortable stance, his fighting style relied on the sheath of the blade as he excelled in laijutsu but he could adjust fine without it.

Warrior Vs Warrior....Master Vs Student... It all ends  Here..

Both warriors were patient...Circling  Each Other...staring each other down...  waiting for the other to make a move...

Then...Y/n attacked

Y/n clashed with mifune,  metal meeting metal,  y/n slashed a few times  but mifune blocked expertly, Mifune returned the favor and Y/N dodged, Y/n the began martial arts to through Mifune off his game

Mifune took advantage of an opening and slashed Y/n back.

Y/n grunted and rolled away,  he placed a hand to his back, the cut was shallow thankfully, The stinging sensation was more annoying than anything else.

Mifune: Come Boy, i know you can do better than that!

Y/n glared and got back on his feet,  he dashed to his  master, he jabbed, then went for a downward slash that was blocked as well,  then it looked like Y/n was about to jab again and mifune got prepared to counter

Y/n inwardly smirked, he counted on that.

He adjusted and slashed upward and landed a diagonal slash to Mifunes midsection.

https://media.tenor.com/b0xINiOE9ysAAAAd/ghost-of-tsushima-slash.gif  

Mifune: "Ughh!!!" He took some steps back holding his side

Y/n: "Satisfied Old Man?"

Mifune let go of his wound, he got back into his stance and in a burst of adrenaline was back on the offensive ,  he was ferocious , y/n forced to block one strike  after the next, taking steps  back as he did so

Mifune then took a page out of  his book , landed an open palm strike to y/ns body.

Y/n: "Nghhh!"

Y/n felt his body  begin to crumple on him, mifune had landed a shot perfectly to his liver

Mifune  Took advantage all too well, he knocked sword to the ground and kicked in the stomach several feet away.

His body was crying out in pain,  he maybe have been superhuman but even he was not impervious to a well placed liver blow.

He felt a foot keep him keep him firmly rooted to the ground  and saw a blade at his throat , mifune looked at him at would someone would describe as look a father gave to his son when he was disappointed.

Mifune: " We could have ruled japan together... The World Even... I will have much to do after you are gone..." He  gripped his blade and prepared to behead The boy he considered a son. " I take no joy in this...."

Mifune however paused when he  saw y/ns eyes glow blue.

Y/N: "Neither do i...."

Mifune couldn't react fast enough to the flying sword that cut through both of his wrists.

A pair of hands and a Sword fell to the ground, Mifune Gazed at his injury taking several steps before crumbling to his knees

The Pain of His injury finally hit him

Mifune: UGGGGAAHHHH!!!!!

Mifune lifted his head to see Y/n back on his feet with Sento Floating back to his hands.

Mifune: "...your families power... i thought it had died out ages ago...who would have thought it reemerge in you, nghhh.....you were holding back..."

Y/n gazed at his now crippled father:  I had hoped to best you with skill alone, i made the mistake of underestimating you because of your old age... apologies  if you would have preferred an honorable battle but i was gonna get my victory...by any means necessary.

Mifune could only chuckle hollowly: Yes... i suppose  i can't blame you for that...so this is where it ends

Y/N: "yes....with you gone and many of the lower ranked leaders crippled thanks to me, the police force will  round you up and your operations will end, the people will be free from your tyranny... the era of the yakuza will be no more.."

Mifune sighed but even now y/n could see his masters resolving holding firm

Mifune: Well... if this is how i end then i have no regrets, i have lived a long life... I don't know where you will go from here y/n, but whatever path you take, i wish you the best....

Y/n got into a stance , he hated the man in front of him but out respect for making him the warrior he is today , he would grant him a warriors death.

Y/n: "....Sayōnara....Oyabun...."

Y/n raised his blade and slashed downward.... One clean strike

Mifunes Head had fallen to the group followed by his now limp body

It was over...y/n was free.

Y/n flicked the blood of his blade and took a deep breath in, and then he exhaled, there was now one last thing he needed to do...

1 hour later.

Y/n was now at the docks, currently looking for a paticular man.... And with his heightened vision he finally saw him, he jogged to him

The Man was currently on his phone then he took notice of Y/n, he was wearing a suit and seemed to be loosing his hair, This man. Was a high ranking member of shield, he was known as Agent Phil Coulson

Coulson: "Hey! You went dark for a while, i was getting ready to call for backup and rush the hideout, you alright? you look like you went through a shredder"

That was certainly one way of putting it, y/n got quite a few injuries in the assault

Y/n: "im fine, this is nothing i cant heal from."

Coulson: if you say so, i still think i should have backed you up

Y/n: "that would have put good soldiers lives at risk and besides...this was personal."

Coulson could accept that though he wasn't happy about it: So...its done

Y/n handed the agent a phone, within it coulson saw proof of it, dead foot soldiers and high ranking members , and even a beheaded mifune, some would throw up at the sight of these images but Coulson has seen much worse working for S.H.I.EL.D.

Y/n: "Theres also files i downloaded of all underground operations of the yakuza, i hope it's enough."

Coulson nodded and Pocketed the phone: " This Is more than enough, we can take it from here, i can't thank you enough, this more than asked of you and you don't know how many lives you just saved."

Agent Coulson and Y/N met several weeks ago, he saved him from an altercation while in a bar , they got along well as Phil was happy to meet somebody that knew english, japanese was not a part of his skillset sadly,

Coulson was on a mission to take out high ranking yakuza that were preparing to infiltrate The U.S and set up base there, Coulson was shocked to find out
Y/N was a member of said gang, he was young , only 21 but that wasn't even the crazy part to him, y/n was willingly giving up information about his said gang, how they moved, their business dealings all of it,

Coulson was confused at first, why was he betraying them like this, turns out the kid was planning on breaking away for a while now, this seemed like the perfect opportunity to do just that and wanted to work with coulson any way he can, Coulson would have been foolish not to accept his help, he was happy everything turned out well.

Y/n: "please you don't have to thank to me, this was a joint effort."

Coulson smiled, humble kid: "Well i think i fulfilled my end of the deal, now with this done Shield can give you a passport and make you a legal citizen ."

Y/n was...conflicted: "you dont have to repay me for this Agent, i am not innocent in all of this , Im more than willing to serve time."

Coulson saw the regret in the boys face then placed a hand on the boys shoulder: "Hey you didn't ask to be part of that life and not many would break away the way you did, and shield did a little background check on you, we saw how you avoided doing dirty work and helped out anyone you could, and with todays win i say you have more than made up for it."

Y/n was still unsure but accepted it: "if you're sure.... What happens now?"

Coulson smiled: "Now me and you to are gonna go on a little flight, i have soldiers here working with the Japans police force to handle the rest"

Coulson and Y/n walked inside a private Jet, Y/N had only been on planes a few times but never something this nice.

They took their seats, Wow y/n felt like he was sitting on a pillow, he placed Sento on the seat next to him and relaxed.

Coulson was seated in front of him: Would you like anything to drink

Y/n: "water?"

Coulson chuckled: "Cmon you're flying first class here!cmon think of something!"

Y/N began thinking and then got a different option: "Orange juice... No pulp please."

Coulson Smiled: "now you're talking"

A waitress showed up with two cups of OJ, y/n thanked her politely and then took a sip, the lovely taste was quenching his thirst already.

Coulson: "So y/n, making you an American citizen is one thing but where do you want to reside? Plenty of states to choose from....i don't recommend Los Angeles....or Florida."

Y/n began looking out the window in thought, where to go from here... then he got something: "New York"

Coulson was suprised to say the least: "Oh you sure? Wouldn't you want something quieter? New York is a Hub for Danger, with all the heroes and villains that reside there."

Y/n smirked at that lifted it up his hand, the orange juice that was in his cup began to float

Coulson eyes widened a bit of in surprise

Y/n: "I think i will fit right in..." The Juice gently filled his cup back up again and he brought to his lips once more.

Coulson couldn't help but chuckle and rub his head: "Of course you got powers, alright then" coulson stuck his head out a bit " Pilot! First Stop New York!

Y/n began to settle in his seat, his mind began to wonder , japan was no place live for him now , no family, no friends, no home, he had nothing left.

His whole life has been shrouded in pain, but perhaps now he can begin a new chapter in his life, one that is finally in his control, , he didn't  know what to expect he would just have to wait and see, he closed his eyes and began to sleep, its been a long day...

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7 years Later

...RING!...RING!...RING!...CLICK..

Y/n lifted his hand off the annoying alarm  and stretched, he sighed and looked to the window , the sun shining through the window of his small bedroom.

This was apartment man  Agent Coulson got for him, Y/n wanted something small but comfortable nothing extravagant needed and now he owned this apartment that resides in the Manhattan borough,  He owed alot to Coulson, he made his transition from Japan To America very easy, he even offered him a spot in shield but y/n politely declined

Y/n wasn't the military type and knew enough about the American government to know they were capable of weaponizing him for the wrong reasons, but assured coulson if he ever found himself in a tight spot he would be there.

Y/n threw on a simple white shirt and black sweat pants, he brushed his teeth and  then went to his living room, before y/n makes breakfast he begins his morning some yoga.

He does that for 10-15 minutes,  Then y/n begins hitting a punching bag built to withstand the blows of super-humans, he had torn thrown quite a few until he called coulson about it. 

And finally he begins practicing with his sword, he was considered the greatest swordsman in japan second only to mifune with the old man dead he now held that title,  the yakuza age was over, with only mere fractions and pretenders trying to keep the glory days alive.

Y/n had mastered most melee weapons, however  he felt most comfortable with a sword, sometimes two.

And honestly with Sento in his hands was like adding was like giving  heavy weight boxer Mike Tyson brass knuckles overkill.

It was rare for y/n to put Sento to use, his neighborhood wasn't crime ridden and there were plenty of heroes to handle business and his he would welcome the challenge if anyone crossed him.

He finished his morning training, and began to whip himself up some breakfast, he was well versed in the typical American breakfast meals, he was quite fond of cinnamon toast crunch, but for today he went with something healthier.

He may have a very high metabolism but that didn't mean he should eat unhealthily any chance he gets, this lean figure took work.

Y/n grabbed his bowl and opened his nearby window and sat on the window seal, enjoying the fresh air and the natural ambience of Cars and people walking to their destination, and it was 8:00 so that means..... oh there he goes

Y/n flashed the friendly neighborhood Spider-Man a thumbs up and he did the same with enthusiasm before swinging off.

And that was just one of many heroes in New York, coulson and was not exaggerating when he said this was a hub for super heroes and villains, he's seen Luke Cage, Doctor Strange , Iron Man, and he swears he saw the iron fist teaching yoga at a park one day.

It would be a shock to him if you told him you lived the New York and hadn't seen the avengers or even the smaller teams like The Defenders at least once he would believe you were blind or insane, the X-men were even a few blocks away for crying out loud!

It was just highly unlikely to not come across at least one super hero here, he wish he knew why so many heroes resided here but it was just another of those things that made New York, New York.

Now one would think that with his , skills and mental powers he would be another one of those heroes, well.... Thats not the case

Y/n was a loner by nature for one thing, even being 28 that wasn't about to change , which was a reason why he didn't really have any friends aside from coulson, and he wasn't sure if he would be a good fit to be a super hero or even apart of a team, with history...it just felt wrong ,he just wasn't sure.

Coulson has talked to him about this before "you can live your life walking this world alone" he would always say, and he gets that but he just doesn't know, he would rather just mind his own business and take out a few thugs in the middle of the night if he was around the neighborhood other than that he was fine.

Y/n was brought out of his thoughts by some sudden shouting.

Citizen: "AYE! GET BACK IN YOUR APARTMENT WITH THAT DUMBASS YOGURT BOWL!"

Y/N: "HOW ABOUT YOU MIND YOUR BUSINESS AND GO SUCK A DICK!"

CITIZEN: "WELL DAMN MY BAD!"

After that interaction Y/N took the last bite of his yogurt bowl and went back inside.

Never change New York.

He threw on some simple clothes, a white t shirt with with black pants and shoes and his katana strapped to his shoulder

*Think Yuta from jujutsu kaisen*

He went out locked his door and saw his neighbor cleaning the hall way with a broom

Y/n: "Need some help Madam Bo?"

Madam bo smiled and waved him off: "No need im just about finished, i see your heading out already, finally decided Go out and start dating?"

Y/n  could help but chuckle and scratch back of his head: " I don't see that happening happening soon Bo, the ladies aren't really into me"

Madam Bo shook her head in annoyance: Ah stupid boy, how would you know if you don't chase after them! You are in your prime now is when you need to take advantage, and maybe you will stop being cooped up in your apartment like a recluse!"

Y/n just smiled, he was grateful she cared so much, it's just a woman being into him? With his baggage?  Unlikely.

Y/n just smiled and bowed a bit in respect of his elder: " i guess we will just have to wait in see, see you at work Monday?"

Madam bo: "Yup" she then pointed at him like the firm grandmother he never had. "And don't be late!

Y/n laughed: "Never, dont work too hard Bo!" He said as he jogged off.

Madam Bo: "And  You find an woman! Preferably older than you she can keep you in line!"  Y/n just smiled and shook his head and made his way out the building

She smiled as she finished cleaning " don't worry boy, you will find someone special, life is full of surprises" she went inside to finally catch up on her favorite Chinese drama show.

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Wow didn't expect to write this much!  The words just kept flowing. Had to stop because I didn't want to make it too long

Let me know what think guys! First time writing so please go easy on me

Il get to part 2 as soon as possible :)