Salvation in the glistening light / GIYUU X MALE OC

Chapter 1 - who?

"Hey! Come on! Get up!"
"Are you gonna sleep the whole day?! You're in the presence of the hashiras!"
.
.
I woke up slowly, my head throbbing and my body aching from the fight and the awful position I have been in. "W-where...." I spoke softly but couldn't as I grasped for air. Panic surged through me as I tried to piece out together what was happening.
As I forced my eyes open, I saw a group of people in front of me, staring. Confusion rushed through my body. As I struggled to sit up, my hands shaking. "Where a-am I? Who are all these people?" I asked.
"Do you not know who you're in the presence of?!
These are the hashiras!" The person pinning me down added.

The hashiras?.....who are they..??where even am I?

"Well shouldn't giyuu take responsibility..?" Said a bandaged man.
Tomioka-san.... He's here!
"Well enough of him let's ask the young boy about his story.... Now why are you carrying around a demon young boy?"
I explained everything what had happened. From the murder of my family to now and how Nezuko would never eat a human.

"Well that sounds hard to believe."

There's a threatening looking man, with scars all over his body.... Wait.... Is that Nezuko he's holding?!?
" What did you say? Her? A human? That's called being completely out of your mind!"
He pulled out his long sword and plunged right into the box. I could hear Nezuko grunting. "NEZUKO!" I shouted. How could he do that? A hashira? I don't give a damn about hashiras now. That's it.
I ran as fast as I can and found an opening.As I was ready to strike, something happened.

In the blink of an eye, a person appeared in front of us.
His movements were so swift, it was as if he had appeared out of thin air. He grabbed my waist with one hand and has Nezuko with another.

"What's going on here?" He said calmly, his voice had a smooth and relaxed tone. His eyes, sharp and toned, stared into mine. He was beautiful. I mean seriously ethereal I would say. His medium golden blonde hair with his extravagant jewellery, shone in the bright sun.
As I admired his features, his eyes drifted and widened.
"Giyuu...."
In the blink of an eye again, he had stood next to Tomioka-san, realising he may have interrupted something.
The so-called "hashiras" also seemed puzzled, unaware of the person who has just appeared in front of us. I could see their visible confusion and looked at the master for an explanation.

"Ah I see... today is the day you meet the light pillar too..." sighed the master.

"I'm Saiichi yahiko... the light pillar."

Who is this man?.....