Toji was currently in Shibuya standing against this own son Megumi . He asked his about his last name . Megumi said that his name was fushiguro .
Toji smiled and said " fushiguro ,not zen'in huh!, Well good for you" with he took the sharp end of playful cloud and stabed himself in head . Toji didn't wanted to lose control and kill his own son so he killed himself . He was happy that Gojo satoru took care of zenin clan business and didn't let his sons get taken by them . He was pretty much sure that Giyu was alright to .
He was not regretting choice of not telling Gojo about Megumi and Giyu . Toji could even go to hell with peace at mind that at least his last moment he was able to somewhat complete his promise that he did to Mei. After this all he saw was darkness , he thought ' I guess now I will be in hell even if that exists .' next moment he saw a light and he woke up . Currently he was in some house and was wearing a blue kimono . He didn't understand what was going on .
Toji tried to look for any mirror or water source to see who's body this was when suddenly all the memories of this man's life flashed in head of Toji . He did not understand why he was alive again and this was happening to him third time . He was not even looking like himself but was in some other body . ' maybe this could be cause of that granny cursed technique and him being a person without curse energy.
Toji was alive and was not his own world or time . This was Taisho Era and there were no jujutsu society or curses. All there was Demon slayer corps , and demons and the man in whose body he was in is hashira . They are like special grade 1 sorcerer.
Toji was looking in a mirror at the dead blue eyes that resembled his son's eyes when he said " so your name giyu too huh , water hasihra . What life have you led sister death ,then friend death , seeing yourself unworthy to the point not even wanting to take the title of hashira and most unexpected thing finding a demon that don't kill humans and want protect human . Well I guess I will see where things go to your favor since I am taking over your body and you have same name that my wife gave to my son maybe she wants me to make some amends."
Toji himself was not much happy on getting this rebirth since he was taking someone else life but he was not some righteous person to feel bad for him . Only reason he was going with this man's wish to protect the Demon girl and boy that Giyu have potential to take his place is because that this person is somewhat replica of his son from physical prospective and he felt that his wife wanted him to make amends by saving life's in this place .
Giyu was the one that one word that made him remarry again when he said to him " sad " . That word was enough to make him all worked up that he married another woman which he never expected after his wife death . Maybe that was the reason he told gojo brat about his sons .
currently he could feel that his physical gifted body from heavenly ristriction came to this world in this body . He could feel that his new body was trying to adjust to his old strength . One thing interested him most was these breathing style that demon slayers used for hunting demons . Who knew that simply breathing different way could give a person such inhuman strength to fight these Demons . He was not in place where people had curse energy and only fighted through there own strength . Currently he was the one that was gifted in this world because of his heavenly restrictions . Toji was also interested to see how well it goes with his own strength.
Even though the breathing style he had was most easy to learn but that didn't mean that toji can't increase his arsenal more . Even learning one move from other breathing style will be enough for him too .
But problem was that tomioka had made his relationship with other hashira so worse that Toji was not even in mood to do something about it and why should he care about it since it didn't matter much to him and he could learn by seeing the normal corps member too .
Even if he wanted to do mission the report will come from crow to him and most efficient for him was that change that might come in his behaviour will not be noticed much since his crow was old and always forgetful . Toji didn't had much problem with doing the work of Giyu, since he will be getting paid for killing demons .
There will be no zen'in clan or jujutsu higher ups to screw him up . The leader of crops was really good man for toji taste but he could make do of it since that man was really sick and die in few years and next head will be a Eight years child . Even though leader of corp might not care about the change in behaviour of this hashira since Toji was only going to increase the strength of corps against Demons . Any changes that will be on his behaviour will consider good since the personality that Giyu had was worse than Toji own in some way.
The leader was like father to giyu and all other members and from memories toji understood that he was not faking that love for all of them too . This man really consider members as his children . What a different world it is that where higher ups are not greedy and organisation is not corrupt and both his world jujutsu society and this one exist from past thousand years.
This would have been a slap on face of Tengen when she would have saw that a what she could not create even after having immortality but was created buy a family whose members can't even live past thirties .
Even Toji had little respect for this after seeing his memories. There were hashira that toji didn't care much since they didn't knew much about tomioka since he was a loner . But the one person that will be problem was going to be this kocho girl who was his partner for most missions.
Toji decided that he will simply try not to talk to her . This was most effictive way to act like tomioka. And why was he doing all this , answer is simple because this place was going to provide his everything he was going to needs till he have enough information about all the things in this knew world . He didn't like how less informed these demon slayer were about these uppermoon and demon king Muzan that they didn't knew a single thing about them other they remain same after 116 past years .
Toji knew that information was most crucial thing world and this was also the reason why he was able to kill so many different curse technique users and defeat Gojo satoru in their first fight . Giyu was on other hand less informed more anyone else in hashiras .
Toji was going to take all the information he could get from giyu's memories . He took a empty book and started writing , First thing he needed was weaknesses that demons had were ' cutting there head by nichirn blade , sunlight and poison that butterfly girl uses. ' then second came there power system which ' upper moon and lower moon '. The uppermoon were like special grade curses and lower moon were like grade one or two .
The lower moon were weak but they all had blood demon art which were similar to curse technique . Toji didn't wanted to run into some certain technique that were like Gojo satoru since this world didn't had special weapon like inverted spear of heaven. And other were , mass manipulation , curse speech etc . All high ranking demons had these blood demon arts .
Third one was uppermoons There was not much info about them other then that they are not changed since 116 years and one was sighted few years ago. The uppermoon 2 who killed flower hasihra kanae kocho , elder sister of current insect hashira . They were strong enough that two or three hashira might be needed in order to take down one uppermoon .
Last one was the Demon king himself , kibutsuji Muzan . He was first demon and have ability to create another from his blood. No one knows how he looked like , toji thought that this was quite different of king of curses . Muzan even after being Demon king never came out much or there was not anyone alive to tell the tale that he was there .
Toji made a guess that Muzan can't be killed from cutting his head since he might have found a way to counter this weakness since he was alive from thousand years. Even Giyu's memories showed that there were many Demon who tried to hide their neck or do something else to make this weakness uneffective .
If Toji needed more information he needed to find this himself since this was taisho era and there were not much ways to find info about these Demons .
Toji put the book aside and went for a bath . It was a new life and he didn't had much to do and there was no mission for tomioka too .
Dfter taking bath Toji took the uniform Demon slayer corps and put it on . It was quite and very strong , this was something Jujutsu high didn't had , there uniform was all just for show since ,those things wouldn't stand against curse or curse techniques .
The sword that Tomioka had was quite good too . It was made by someone who put his heart and soul into it . craftsmanship was great and Toji was a person who liked good weapon since they are the reason of there success in fight.
Currently he was trying to use the water breathing and was quite successful in it. Giyu had made it his muscle memory from intense training that all it took toji was
following the instinct and he was able to perform it.
He decided to use all form of water breathing.
"Water breathing : First form : Water Surface Slash"
" Water breathing : Second from : Water Wheel "
" Water breathing :Third form : Flowing Dance"
" Water breathing : Fourth form : Striking Tides"
"Water breathing : Fifth form : Blessed Rain after Drought"
" Water breathing : Sixth form : Whirlpool"
"Water breathing : Seventh form : Drop ripple thrust"
" Water breathing : Eight form : Waterfall Basin"
" Water breathing : Ninth form : Constant Flux"
" Water breathing : Eleventh form : Dead Calm "
' Its quite an impressive sword style but can use some improvement for my speed ' Toji was just thinking this when the crow came and almost hit the tree but Giyu's body reflexes made toji made move himself and before kanzoburo could hit tree Toji caught him . The crow was tried from all the flying so Toji put was and food for him and took the mission details from his leg .
Toji didn't mind bady sitting the crow since he needed him to not blow his cover . It was a mission to slay a Demon near the area where Giyu meet that Tanjiro kid . Toji went and took the katana and left after saying thanks to kanzoburo . Toji was not that bad to thank the one who is in his favour .
Toji simply left with such speed that even kanzoburo was shocked and thought ' he gotten fast , was I forgetting to pay attention , well guess old age catching up to me'.
Toji wanted see the Demon himself and watch that regeneration ability that he left really fast that sound barrier was broken .if the Demon was strong then he can get a idea of how dangerous a blood demon art can be compared to curse techniques .
Few hours passed
Toji was reaching near the area Demon was supposed to be . The breathing style was had increased his already large amount of stamina and Speed more and all that left was to see his strength.
There was not much things that were interesting in Taisho Era other than demons for Toji and for his luck there was much time left in night time , so he decided to gather info about Demon because that would be important if it is a strong demon .
Toji was not a person who would care much about this rebirth , so the moment he understood things he just decided to go with flow for the moment and its not like it was his life . He had already lived his own and was not proud of it . Though he wanted to see where he will go in this new life .
Toji was already in town and started asking people about something out of ordinary at tea store or other area . He got the news that only one person went missing till now . Toji understood it was not a strong one , well that was disappointment but he decided to finish it in one go .
He waited till nightfall and went at a house roof . Toji senses were superhuman but breathing technique helped it increase even more . Toji's nose caught a foul smell and he understood that it was a Demon .
The Demon was going to attack a woman when toji with a single strike cut down its hand . Then he looked at woman and said " get out of here if you wanna live " . The scared woman was almost frozen in fear when she looked at demon. She gathered her all strength and ran away from there after Thanking Toji . Well , getting thanks from someone was weird for Toji but then he looked at demon . It looked a little terrified of Toji , this was look he had seen people he killed had before dying from his hands.
The Demon said " spare me , I will not do it again"
Toji looked at him and said " why should a care ? " He was little amazing how demon's hand regenerated in few seconds. That was not even possible for reverse cursed technique.
The Demon looked scared and said again " I promise I wouldn't do it again . I will not eat them anymo- " then the Demon tried sudden attack at Toji but he failed and it took less then a second to behead the Demon .
Toji was thinking that the Demon have great regenerative abilities but we're weak compared to curses and biggest thing was that they lacked skill that even a grade four sorcerer could kill them in seconds .
Then Giyu's crow came saying " message message Giyu go to snowy mountains at North . Demon had eaten several hunters there . Kaww Akkimesatu." Toji tought ' straight another mission huh' , well I don't mind it much and started walking towards north after putting his katana back in scrape guard .
Toji was fast in his pace before but now decided to slow down since demon only come out at night he will have plenty of time.
(Sorry for any grammatical mistakes...)