From birth Izuku was always different from his twin sister Izumi. His whole family thought him deaf because he had never said a word and unlike any of his true family he had maroon eyes and at least his father and sibling thought he had green hair b...
After we arrived I was intrigued to see what looked like a descendent of my family Izuku's friend Katsumi.
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--- Katsumi's look this artwork was done by Pencilwithnotip over on the Kimetsu no Yaiba fandom wiki. I might do my own drawing for this at some point not sure at the moment. ---
I decided to go over and talk with her since if my suspicions are true they are my, many greats, grand niece. "Hello there little lady how are you doing today?" I asked her.
"I am doing fine Rengoku-sama," She said giving a slight bow. "I was just going off to train by myself since Izuku is taking charge of training the newbies."
"Rengoku is fine." I said rubbing the back of my neck. "If I remember correctly Izuku told me you use the Flame breathing technique is that true?"
"Indeed but unfortunately it is incomplete," she told me. "See the books pretaining to Flame Breathing suffered some significant damage over the years. Effectively the sixth, seventh, and Eighth forms were all lost to time I have been trying to find them again but I have had little success."
"Well I can help you with that I was the last Flame Hashira after all," I said offering my aid to her. "Maybe if you accept and I find you worthy I will pass something on to you that only my family has been able to master."
"That would be amazing Rengoku!" she said excitedly. "What would you teach me that only your family has been able to master?"
"The secret Ninth form of Flame Breathing of course," I told her and with that she took me up on my offer we would begin her training tomorrow.
Katsumi POV:
It was the next day and finally I would be able to master Flame Breathing. I couldn't wait I woke my brother up and we both rushed out the door, leaving a note for our parents to let them know we already left. We got to the estate and split up going to our separate training areas to meet our teachers.
I got to the area and Rengoku jumped from down a tree, "You got here early Katsumi that's a good thing" He said. "Now then lets begin."
"Right," I responded.
With that he began to show me the sixth form, he had a training dummy set up. "Total Concentration Flame Breathing, Sixth Form: Final Ember!" he called out the name of the attack and swiftly he drew his sword and with great strength slashed from the right into the dummy. Then he lowered his blade slightly and with insane speed to rival Izuku's he swung back around to the left completing the feint attack and decapitating the dummy. Finally he swung his blade down and sheathed it an whipped off the handle.
"That was amazing," I said excited.
"He I remember when my former Tsuguko would behave similarly," Rengoku said looking at me fondly. "Okay now follow along with my steps. One," He called and we drew the blade. "Two," slashed from the right to the target. "Three," Lowered the blade. "Four," Swung back around the left to decapitate the target.
We practiced the sixth form for a while then he decide it was time to move on for the day to the next form. "Flame Breathing, Seventh Form: Blinding Cinders!" He called out and performed many rapid sword slashes and then he delivered a powerful strike to the target. We then practiced that for a few hours till he decided it was time to move on to the final form. "Flame Breathing, Eighth Form: Fire Storm!" He ran around the dummy with his sword drawn and began to twist his body violently around I imagine to avoid attacks and periodically he rushed in and delivered an attack on the dummy. Then he would return to evading the attacks and would continue taking the random strikes till he decided the demon was "finished".
With that we practiced this last attack until the end of the day. That is who it went continuing the training then next day and keeping at it till I had a grip on the new forms which took till about three days before the sports festival leaving me a decent amount of time left to practice them more on my own.
"Okay Katsumi it is time I tell you the truth,"Rengoku said to me as we walked over to our usual training area.
"The truth about what?" I asked him.
"I believe that your family descends from my own back when I was still human." He told me, "That is the real reason I have decided to teach you the secret ninth form of Flame breathing. It is a technique passed down in my family and I would like the tradition to continue in some regard."
"What the fuck?!" was all I could muster as a response. "What even makes you think we are related?"
"Well it tracks based on my baby brother remaining human out here," He said. "Then there is your hair and eyes, my families genes are very strong. Even if you aren't related I trust you with this technique."
"Well if that is how you see it," I said. "Then I feel the same thank you Uncle I guess." I hugged him Tightly.
"Indeed, dear Katsumi now lets begin with luck you can learn it by the festival." He said pulling out of the hug.
--- Sorry for the short chapter and I think I will skip my initial plans for the next two chapter for a few reasons. The next chapter will either be the first part of the Sports festival or maybe another villain perspective depends. Also thank you Kindly to Rai_Phoenix for answering the question posed in a chapter from a while ago and Inspiring me for this chapter by doing so. ---
