3rd POV Sengoku Era

The wind was blowing. Snow was falling. It was a bad blizzard on they ordinary day. People couldn't even see 5 feet in front of them, so no one should've been outside. Except one person. But not any ordinary person... a young demon slayer named Y/n L/n. He was kicked out of the corps for letting a person he loved now demon go. Even when young boy, people called him many names, 'monster', 'inhuman', 'demon', or anything that seemed to dehumanize him. This was because he didn't look like an ordinary being. The huge scar on his forehead, chin and forearms. The scar looked like flames bursting out of his scalp, and arms, so no one thought he was human. There were also rumors of demons around Japan, so people thought they existed. Of course they did, he killed plenty of demons as his time as a Demon Slayer. Even the Demon Slayer Corps hated him, calling him a 'traitor', 'A demon lover', 'weakling', 'coward'. All because he spared someone he loved, who had become a demon. He now hated the corps, and everyone who wronged him. 

It was getting colder and colder by the minute. He was struggling to breathe, and it got harder to breathe every time, he then collapsed to the ground on his knees in pain. But then he saw something... a figure?... a man... he saw a man... a tall slim man... and he was walking towards him. He then could make out who it was... and it was none other than... Muzan Kibutsuji. He wasn't hallucinating, he couldn't be, it was the Demon King himself, the one that Yoriichi tried to defeat. Muzan slowly walked towards him, and even so he tried speak but it was pointless. It was freezing and the cold sealed his mouth shut. Muzan then spoke.

Muzan : "Why are you out here all by yourself young slayer, in this freezing blizzard... all alone."

He was silent, he couldn't talk. But he still tried too. After a few moments he did.

Y/n : "I-I was kicked o-out of the Demon Slayers Corps."

He saw his features that were not normal, not human.

Muzan : "And why is that?"

Y/n : "I... I couldn't...  kill someone that I loved, that became a demon..."

Muzan : "Hmm... is that right?"

He looked and saw that Muzan had long... sharp nails.

Muzan : "What if I told you.. you could get revenge on everyone who wronged you? What if you could get make them suffer as you did?"

He looked at Muzan, his eyes wide and he knew what he was saying. Muzan's hand reaches out to the young man.

Muzan : "What if I offer you the chance... to become a demon... and be with the one you love... would you accept?"

The young man thought for a moment. He could get what he wanted. His revenge. His revenge on all those people in his old village that de-humanized and the demon slayer corps him in the past. And the demon slayer corps who turned their backs on him just for hesitating to kill someone he once loved. He had heard and knew that demons were powerful, and could instantly kill any desired human. He smiled. He then looked up at Muzan, to see his hand still outstretched.

Y/n : "Sure... why not." 

Muzan smiles as Y/n then passed out, in the cold snow.

3 days later...

Y/n POV

My eyes shot open. I shot up from where I was laying. I look around and saw I was inside some kind of house. I felt different, I felt stronger, I got up and looked outside, it was nighttime and the stars were out, I then felt a presence behind me and I looked to see who it was. And who I saw made my eyes widen. 

 She might be looking down, but I know exactly who it is.

Y/n : "Mika?"

She looks up and smiles at me.

Mika : "Yes... my love... it's me."

I run over to her and I hug her, while she wraps me in her arms.

Mika : "We can finally be together... forever."

Y/n : "Yes... we can."

To be continued