Two weeks have passed in blink of eyes. Oikawa isn't a prodigy or genius.
The setter appreciate that you teach him how Total Concentration Breathing form with a lot of patience. He hates to admit but you are a good teacher even though you are only twelve years old aka six years younger than him.
All these two weeks as expected that Oikawa know that Kaname is a demon but he's special.
The demon doesn't need to eat human or drink blood. It's quite mysterious that wisteria and sunlight doesn't affect on Kaname.
It's like he's a immortal.
The setter noticed that his stamina have start to improve but he still haven't able to master Total Concentration Breathing or how to use a katana.
Everyday you told the male to run up and down to the mountain and tell him to swing his katana 2000 times and add if you are in bad mood.
Oikawa slowly got use to this training but he admitted that the training still tires him.
You explained him about demons,their weakness and about demon slayer corps.
You also explained to Oikawa that why you teach him two breathing styles. You want him to use one breathing style and use other as if his life is in danger.
That's how Oikawa decided that he will make water breathing style to his trump card.
"1998!1999!2000!I am done swing my katana,Y/N-Chan!"Oikawa look at you who sit one of the border while looking at the sky.
Oikawa noticed that you always sleep or space out ignoring what happening around you.
Oikawa look at his hands while what Kaname told to him a week ago repeat in his mind.
Flash Back
It was a normal day for Oikawa while Kaname was teaching him how to use katana today.
"Let's take a break. You look like a ghost followed you"Kaname look at Oikawa who was heavily panting while his whole body was cover with sweat.
"Kaname-San!"
"It's Tsugikuni to you"The demon deadpans to the volleyball player who sweatdropped a little bit.
These past one week he noticed that Kaname personality change into 180° when it comes to you. He's cold,rude and heartless to him and others but caring,clingy and innocent to you.
"Tsugikuni-San"
"What is it?"
"How long will it takes a normal person to master Total Concentration Breathing and Breathing Styles?"Kaname pauses a little bit.
He put his right hand to his chin. "It took a normal person about two years to master Total Concentration Breathing and Breathing Styles''The words that wrote two years rock slam on Oikawa head.
"When you are ten,they called you a prodigy. When you are fifteen,they called you a genius. Once you hit twenty,you're just a normal person"Oikawa look at Kaname what the demon just said.
Kaname blue orbs stare at Oikawa's brown eyes.
"To others who doesn't know N/N always thought that she a prodigy without knowing the truth"
With that the demon left Oikawa who have a confusion look on his face.
Flash Back End
"Ara~.You're training hard"
''Y/N-Chan!We come to visit to you!!!"
Oikawa look at the two females and a black haired male the cover where his mouth was with bandages.

YOU ARE READING
Dusk Till Dawn (Haikyuu X Child Reader X Demon Slayer)
FanfictionShe lost everything at one night but received something at that night. A demon killed her family but she was saved by a man who promised that he will protect her. He taught you Total Concentration Breathing and Breathing Styles. One thing that you k...