The legacy to of hashira's as cursed technique.
It was morning at weekend and giyu was training and forcing Megumi to be with him .he wanted to teach Megumi breathing style for increasing his physical abilities since Megumi cursed technique was summoning shikigami ,so it didn't gave Megumi any advantage if it became close combat with high speed .
Giyu don't have nichrin Blade but luckily water breathing was most easy of all breathing style so he could teach him it .
Giyu used (transparent world) to help Megumi put his breathing in rythem. A normal person needs hard training for just to start learning breathing technique but sorcerers were different they were born with stronger body. it was something giyu learnt from whenever he came in months to see them , that man lived in his own pace . This was something for which giyu envied Tengen in his past life and Gojo in present .
Megumi complained a little about it but giyu said it will not be difficult in future if he keep training . Giyu didn't have much knowledge about jujutsu but he sure had about breathing technique and he was going to beat it into Megumi.
Megumi: what is even the point of it . How will I become strong like this .
Giyu : this is something to help you to increase your stamina. you will understand in future.
Megumi was smart and had potential and giyu was to bring it forth before they go to jujutsu high.
But main reason was so that he connect with his brother since he didn't knew about Megumi mindset towards till Gojo showed up.
Giyu wanted to be caring brother like tanjiro but he sucked at interaction even if they were improved after final battle while but with tengen and tanjiro.
there was still a lot of work to do upon it . Only way he could think was through training just like that boar head boy inosuke started to like him .
Well it was reasonable choice but not for Megumi . He already liked giyu because of his caring nature but just like him he didn't show it and just was not good in social skills to understand it .
Few months passed
Giyu was only able to teach Megumi basics of breathing style because of his lack of teaching skill and social skills but he also didn't had that environment that he himself was trained in his past life by master urokodaki but then again he didn't want to throw his brother from waterfall just to train him .
Some time between there training Gojo appreared behind them ,but Giyu and Megumi paid him no mind .
Gojo : now that not a good way to treat your Sensei ! How could you two ignore me , now I am heartbroken.
Gojo talking in his usual childish ways but he was happy to see they both were getting strong . Megumi on other hand paid mind to Gojo and asked what is he doing here . To which Gojo replied that he was there to check there progress .
Gojo : ok let's go .
Giyu : where?
Gojo : there small curse nearby let's test you both and see your progress .
Giyu was little hesitant but he agreed since he never seen the curse from near after he started paying attention and nor he have any way of finding it . They went to an old park near school .
Gojo: now we are here you two will learned to sense curse through your curse energy . Try focusing and see if you can see higher curse energy somewhere , it like sensing negative emotions. Where you get a feeling something is not right try focusing there .
Giyu being formar hashira he was able to detect it easily but it few minutes for Megumi finally be able to sense where curse spirit was . Gojo wanted to see Giyu in action so he said "Megumi last time you killed the curse but this time it giyu kun turns to show his talent and giyu kun since you don't have a curse technique try use using cursed energy to in your punchs like this ." Gojo showed giyu how to use curse energy , giyu used transparent world to see the flow of cursed energy in even more better way by observing gojo body and was able to use it .
Megumi growled a little at gojo trying to sideline him but he agreed . For giyu seeing Megumi like this was cute.
Giyu went towards the curse. In past life giyu and sanemi used to spar even without swords so they mixed their breathing style to hand to hand combat a little . Giyu went near the curse ,it was ugly like demon and had many tentacles , four eyes but no nose . Giyu used cursed energy in his fist and attack curse.
" Water breathing : forth form : striking tides"
He used his fists instead of sword and launched punches at curse , suddenly water started form on his fist in mid attack and giyu back down .
Curse was intelligent and tried to flew . Gojo was watching it with Megumi and after seeing water he thought 'elemental curse technique are rare but it seems he have water , he is natural counter to kamo clan's blood manipulation technique.' after seeing giyu confused and backing down gojo shouted "Giyu boyo don't be afraid it's your cursed technique." .
After hearing this giyu thought that how fitting it was that water hasihra cursed technique was water in this life was water manipulation.
Giyu after seeing curse retreating followed him with Ninth form.
"Water breathing: Nenth form : splashing water flow."
With quick footwork to closed distance and used Tenth form to finish of curse .
"Water breathing: Tenth form : constant flux"
Suddenly water around giyu hand started forming into shape of dragon head and when giyu launched punch on curse, the dragon bit of upper half of curse and excorsiced it .
Gojo teleported behind Giyu with smile on his face
Gojo: very good ! You really were very good at control of your curse energy and technique , you were good at taking control and manipulating water to use it for your advantage.
Giyu was little happy with his cursed technique but there was like he was still missing something so he tried to manipulate cursed energy on his fingers but it turned into four different elements , his fingers has fire , water , electricity and wind upon it .
This sudden show interested gojo he even more . Have ability to manipulate one element it very and he can use four this is unheard of. Look like future is going to be interesting .
Gojo: now that interesting look like you have very interesting technique to be able to manipulate four elements.
They started walking towards Megumi .
After exorcising few curses with Megumi and Gojo they went home . Gojo said that they are ready to and just need to learn thing about jujutsu society that they will learn at jujutsu high .
Giyu little suprised after finding about him being able to manipulate fire , wind and thunder with water but more surprising was that he had information of thunder , wind , flame and sun breathing in his mind .
They just entered house when suddenly a screen in front of Giyu
[Water breathing mastery 70 %]
[Wind breathing mastery 0.05%]
[Flame breathing mastery 0.05%]
[Thunder breathing mastery 0.05%]
Giyu went inside his room and sat on his bed , he was trying to figure out if it was related to his cursed technique. When screen showed [mastering flame breathing style can be used for resurrection of flame hashira ]. It startled Giyu does this mean he can bring back hasihra to life of other people to like sabito , the screen showed people who can be resurrected . There were kocho shinobu , muichiro tokito with his brother yuichiro , rengoku kyojuro . There was a message which showed only there hasihra can be resurrected because other were already reincarnated and sabito too. But major questions was should he brings them from one ended cursed life to another one when suddenly avoice sounds that said "they don't need to be jujutsu sorcerers and can live normal life but they will have curse energy higher then Normal people there life will be edited to this world and these hashira want to protect people so they have not resurrected to other world ."
Giyu understood that he himself died with this desire to protect again not having regret.
Then suddenly there four kasugai crows in his balcony , Giyu recognised them, there were kyojuro crow - kaname , muichiro crow - Ginko with large eyelashes and filled with pride, kocho crow - En and lastly his old companion and friend his crow old crow - kanzoburo .
He was the first one to spoke From them "it's good to see you again giyu you are little bright then past life ."
Then kaname spoke "master giyu I am very thankful to you for giving us opportunity to and accepting the offer to bring my master back to life , rengoku-san asked me to give message that he wants to come into this world to be able to Protect people ."
Then En spoke "master Kocho have same desire her sister and family have moved on to afterlife."
Ginko said "I am also thankful to for letting muichiro and yuichiro being back in together here."
Giyu just nodded to them and said that they can stay here . Megumi and tsumiki were little suprised to see Giyu having for big crows with him . Then Giyu said that he is keeping them and they stay here.
En liked tsumiki because she was like elder sister kanae . She started to stay near her . Kanzoburo liked Megumi he was like giyu but more brighter . Kaname and ginko stayed near giyu .
For tsumiki and Megumi suprised the crows were very smart and we'll behaved other than ginko he was still prideful and didn't let them near her . Giyu said he trained them and named them . Megumi was confused when he did this but didn't as because From his prospective giyu Even as his twin was very mysterious .
Next day Gojo came to give them some books about jujutsu high but was surprised to see crows and thought mei mei was near but Megumi said they were giyu put and he trained them and don't know .
Kaname suddenly he liked spoke that she like Gojo .He was like kyojuro and tengen mixture for him . Gojo was surprised that crow spoke and thought this definitely a curse technique but there was cursed energy was not like mei mei crows .
Giyu explained that he trained them in special way they have there own personality . This interseted more and he asked can they attack to but giyu simply deined that they are not for such things and he will not allowed . Giyu shielding crows was very cute .
Gojo : so why did you trained them ? For fun or lack of friends.
Giyu snapped a little but said "keep an eyes on curses and seeing that there no danger near tsumiki and I have friends"
Gojo laughed a little at last part but he was impressed by giyu knowledge and being able to train crows for keeping an eye on his family .
Gojo : now now no need to be angry I just seen you near any other children that why I said it , by the did you choose them because they more cuse energy than normal crows .
Giyu simply nodded. Then he took books and went to his room . later send En to find and keep eye on tsumiki and said to them to no speak in front of people and tsumiki because it will be paim to explain this to them .
Few days later
It been few days since he started practicing flame breathing and sun breathing . These both mastery and a from someone with cursed energy hair for dna was needed to resurrection but sun breathing was compulsary for everyone . Strangely muichiro brother yuichiro had affinity for thunder breathing and it was needed for it . Wind breathing was for muichiro and water , wind and sun breathing was needed of Kocho which was most difficult in all.
Giyu sometimes had dream In which he had dreams in which talk to rengoku and he game his instructions for flame breathing there .
Giyu wanted him in this world first because he wanted some one who can keep hopes up near him and Megumi . he also could help in interaction with other hashira and people because he was someone every person liked .
[Water breathing mastery 73%][ Flame breathing mastery 2.5%] . His progress was slow because it didn't match he personality and was polar opposite in breathing style to water breathing.
(There will be time skip till there high school before tsumiki curse sleeping accident)
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