Reborn in demon slayer as an Uchiha

Training

I saw him drawing something on the paper he was holding.

I approach him slowly in preparing my body for a fight he pretty strong 'so what will it use today'I though to myself while turning on my sharingan.

He looked at me in smiled like a human looking down to a bug , he put down the paper in a kunai.
'So today we learning about seals amazing I was always amazed by them' I thought to myself but because I'm in my head or consciousness I suppose he heard it too

He rush at me in throw a punch at my face I was prepared so I dodge it with all of my effort, I try to retaliate by trying to hit his head but he dodged in punch me in the chest I took the opportunity to kick him in the face.

While he was flung away he made a hand-sign I looked down in I saw a tag on my shirt
"Katsu"mysterious figure said
"Substitution jutsu" i said
I got away from the explosion but not fully 100% my clothes for my upper body is gone

While I was looking at my torn clothes I got gut punch so hard that for sec I hallucinated that I was back on earth before I got back to reality he was already behind me .

He try to break my back with a kick, but I dodge it by backflipping over it when I thought it was over he was slamming a blu ball on my gut that grinded my skin in pushing me away from him.

'Was that the rasen.....' I was thinking before I got kick in the face in went flying .
I got my balance back while I was fling so I back flip to land on my feet in use a combination of flame breathing fire form unknown fire in thunder breathing first form thunder clap in flash in dashed
Straight at him hoping to get a hit he looked at me in stood still like he was baiting me but I didn't really care I lunge at him with everything I had but when I was 4m away from him my body froze like I was paralyze.

"How many goddam seal do you have on me "i said
He put his hands up in put up five fingers.
"So you telling me there 3 more seal on me or around here"i said

It just started doing hand seals at very quick speed I wonder what kinda Justus he finna use next

'He doing the hand-sign for a jutsu what justu need to be still to be very dangerous' I thought to myself while he started by the doing the horse hand-sign then did the serpent the ram monkey boar horse in tiger hand-sign with very quick hand-sign I don't think I could follow it without my sharingan on "Fire style fire ball jutsu"

"No No nooooooo" i yelled out before I got burned so badly that I look like burned coal.

I looked back to see him doing some hand-sign which are ox hare in monkey.
I then heard the noice of a thousand bird chirping he ran at me with faster speed than before.

He was 5cm away from my chest in then ......

A/N I hope any of y'all don't mind that I take some liberty with demon blood demon art in the story in general I don't just want to follow canon I want to make a new canon in also this entity will be how the mc learn new jutsu but he will have to work for it if he need further instructions.