Start Simulation

{1st POV}

In large bold letters there was written

[DEMON SLAYERS ] on the system screen.

After I saw this I asked Mes in a very monotone voice "What is the meaning of this Mes? "

To which Mes answered <Master it means you will get to simulate you life in demon slayer world>

"Not that Mes" I said

After some time I continued "I am asking how is Demon slayer world a mortal world going to help me get stronger in a cultivation world"

<Master Fate and karma works in mysterious ways, if you get this world as your first experience then it should be because of some reason> Mes replied

"So, do you know why it happened?" I asked her again.

<Yes I know the reason for that but before you ask me why , it would be better to experience it first hand why it happen and start the simulation >

When she said that I became silent for sometime then said in an unsure voice "Is it really gonna make me stronger?"

<Of course host> She replied in a very confident tone though it is not noticeable because of her robotic voice but after spending One year with her I came to notice the small details in her tone. She continued <You can take my word that you will become significantly stronger than now by the time you choose another world to simulate>

As she said all that in a very confident tone I decided to trust her for now and told her to simulate. When she opened the demon slayer tab more two tabs appreared in the screen which says

[1)EXPERIENCE

2)A. F. K]

As I didn't want to use my brain I asked Mes to explain the meaning of these two tabs.

<Master with selecting one of these two tabs you can choose how you want to simulate.

1)If you select EXPERIENCE tab you can simulate in a VR like experience where every decision will be made by you. Where for the timebeing you are simulating you lose your connection to your real body but don't worry as the system will take care of your body and I will control it for the timebeing so that others don't become suspicious.

2)And if you select A. F. K then your simulation avatar will be controled by your soul copy which is exactly like you and make the decisions. But in this opption your avater cannot stay alive for more than your actual mental age, i.e You died at the age of 28 in your last life so we can say that your mental age is 28

and because of that your avatar will die at the age of 28 so that there is no risk of double personality.>

After Mes explained everything I without wasting anytime chose EXPERIENCE tab and started the simulation.

Before starting the system asked me at what age I would like to like to start the simulation and I chose between 13yrs old to 25 yrs old which means I will start by taking over a body whose age is between 13 to 25 at the start of the simulation. And it seems like I can't choose my maximum age limit to be older than my actual mental age.

Anyway the simulation starts and my actual body become unconscious and fall on the bed.

{A/N : MC's name will be Dan if he don't wake up as any of the main casts in the series}

Meanwhile in the simulation

[You woke up in a normal wooden Japanese room which you don't recognise.

After some time you seem to remember why you are here but before you can ponder more upon it a very painful headache hit you and you recieve the memories of Dan while you become unconscious.

Half an hour later you wake up in daze and concentrate on the memories you just gained.

It seems you are 24 yrs old and a demon slayer. You are currentlt at the headquarters of demon slayer corps.

You use wind breathing as your main breathing style and it was you who introduced the current wind Hashira Sanemi to his teacher.

Few days ago every member of demon slayer corps was called to the headquarters of demon slayer corps. After reaching here you got to know that Hasiras are giving special traning to everyone of the corps.

Judging from the current events you assume that it is the beginning of the Hashira training arc according to the manga.

It is 5 o'clock in the morning so you go to the front yard of the mansion you all corp members are staying while in the way you stumbled many times on the path as you are not used to your body yet.

After reaching the yard you start to practice some basic physical workouts and get used to your body then start performing every form of wind breathing with the wooden sword you found nearby. You perform four cycles of wind breathing from 1st to 9th form befor stopping.

You get fresh and eat your breakfast before attending the Grueling basic physical workouts with Tengen Uzui the former Hashira and came back of your room at evening. After eating your dinner you dive into Dan's memories and visualize every battle fought by Dan with demons, when you don't understand something you go to the yard and try to perform the movements you have seen in the memories.You repeat the same routine every day.

After completing his training which laster for 7 painful days you went to look for Muichiro Tokito the Mist Hashira who will train us in high speed movements followed by Mitsuri kanroji the love Hasira in flexiblity of the body, Iguro Obanai the serpent Hashira in precision of the attacks and sword man ship , Sanemi Sinuzagawa the wind Hashira traning in making infinit attacks and finaly Hajime Gyome the stone Hasira in strength. Which you completed it all except for the traning with Sanemi, Muichiro and Obanai you completed every other training pretty fast because even if the instincts of your new body is very good your reflexes have degraded as a side efect of your invasion in Dan's body so it took sometime to regain those reflexes and even improving while sparing with Sanemi.

One night when you were performing wind breathing in the yard, you heard the sound of huge explosions going of in the direction of Oyakata sama's house. At which you remembered that one of these days Muzan was supposed to attack the headquarters.

As soon as you heard the explosions you immediately rushed towards that direction. After reaching there you noticed the change in the surroundings and knew that now you were inside the famous Infinity Castle .

As you ran towards a random direction you encounter many chimera demons who are as powerful as lower moons. You kill those demons and move forward while opening a door inside which you see Mitsuri and Obanai fighting the demon controling the Castel.

You shout and tell them"I will destroy it's doors and surroundings you two focus on killing it " to which they nodded.

After you three kill the Biwa Woman named Nakime you all come out of the castel, only to see the main trio characters and everyother Hashiras fighting with the Demon king Muzan so you three too engage in the fight.

After few hours of the grueling fight Muzan king was burned by the sun but he entered inside Tanjiro and turned him into a demon luckily he was suppressed and turned back into human and Muzan finally died....but ...at what cost... except for Sanemi and Giyu every other Hashira was ...dead. You were not dead because you mostly assisted the Hashiras from behind even then many bones broke in your body and you suffered numerous wounds.

After you were done with the funerals of the dead and the ones who survived got medical treatment you were given large sum of money by the new head of the corps which is now disbanded.

You bought some plot of land and established numerous types of shops in those areas and started delivery services which became very successful and became a very rich man in you 50's. Got a wife when you were 28 yrs old. Had three children in five years. And lived a happy life.

Now you are 75 yrs old, your wife died four years ago, your children inherited your bussiness.

Your only regret in this life is that you never awakened the Demon Slayer mark and didn't get to experience the transparent world.

Like everyday today too you came to the forest behind your house to practice your Wind breathing and swordsmanship. But you encountered a strange creature in front of him.

In front of him there was standing a tiger in crouching position ready to pounce on him any time. Observing the tiger infront of you, you decided to, for one last time unleash your sword for killing.

You unsheathed your katana , took the same stance Rengoku took before using Purgatory on Akaza.

You took a deep breath filling your lungs to the brim transferring every ounce of your strength to this one attack.

You and the tiger at the same time rushed towards each other, before swinging your sword there was only one thought that came to your mind... 'Beautiful'...as you have aquired the Mark and gained access to transparent world ]