■Y/N's POV■
I see him again....

The man with bright blazing hair holds his hand out for me to take. I approach him, walking even closer but suddenly the view around me changed. I look around became frightened, once again I look to where the guy is, but my heart hitches.

He's now there bathed in blood, a hole could be seen on his abdomen. My feet move on their own as I crouch down in front of him. He's totally injured but he still smiling at me. I can feel as tears roll down my cheeks

"Why did I cry? I don't know him... right?"

My hands reach out to hold his face, as he leans and presses his cheeks into my hand. I could feel my heart clenches, somehow knowing that we will be apart. My mouth moves on its own now, as I speak to the guy.

Y/N: Rengoku san...

"Why does my heart aches a lot for this guy?"

The guy who's name is Rengoku, reaches out to me and rubs my cheek. His eyes are tender, thumb gently wipes my tears away.

Rengoku: Please.... call me by my name...

I could see that his eyes are getting narrow, they're about to close. My heart hurt so bad seeing him like this.

Y/N: Kyoujuro san.... 

He smiles at me and puts his head on my shoulder, he whispers into my ear.

Rengoku: I'm sorry... but... I will fulfill my promise... in another life... 

With that, his hands fall to his side and I cried.

Y/N: Noo!

~Woke up from dream~

I was sitting on my bed, panting so hard. The door to my room was slammed open and my brother Shiro walks inside, he then sits on the side of my bed.

Shiro: Y/N nee, you okay? why are you screaming? and... you cry...

I lift my hand and feel the wetness on my cheek. He's right I'm crying, why am I crying? Shiro is staring at me worriedly. I shook my head internally and smile at him, patting his head.

Y/N: I'm sorry... I... think I have a nightmare... but I'm okay...

Shiro: really?

Y/N: yes, now hurry up and get ready!

Shiro walks out of my room to get ready, and I do too. I can't help but think about the guy in my dream. I've been dreaming about him since I was fifteen.

The man named Rengoku Kyoujuro, has bright yellow hair with a streak of red. He wore a white robe with flame pattern. One time I dreamt of him in a good dream, but sometimes it was a bad one, like just now.

Y/N: I... from that dream seems close to him...

■3rd Person POV■

Y/N eats breakfast with her brother and walks out of the house together. Shiro is a third-year in high school, and Y/N works as a docent in a museum. 

Shiro: Y/N nee... if you're busy, you don't have to come...

Y/N: no Shiro... it's okay, I'm going to end my shift earlier today and go to your school... as your guardian I'm going to take your report card... okay

Shiro nods and then he left while looking back and waves his hand. Y/N watches her brother with a smile and then walks to the museum where she works.

Y/N's parents died recently in a car accident, leaving her with her brother. Y/N's now her brother's legal guardian, the two are really close. Today is the report intake, and Y/N going to ask permission to leave early to take her brother's report card.

It's three in the afternoon, Y/N is walking to Shiro's school. There she saw Shiro in the hallway talking to his friends, then their eyes met. Shiro approaches Y/N and then leads her to his classroom. 

Shiro: come on Y/N nee, I'm the last one... Sensei sorry for the lateness, my sister's here now...

??? Sensei: it's okay L/N

Y/N was stunned when she hears the teacher's voice. Right after she steps inside the classroom, and turns her gaze to the teacher, her eyes widened. And so does Shiro's teacher. 

Right in front of Y/N, stands a man with bright yellow hair and red streak. He looks exactly like the man from her dream. The two stare at each other's for a while, until Shiro steps in and Y/N looks at Shiro's worried face.

Shiro: Y/N nee... wh- why are you crying?

Y/N immediately brings her hands to her face and wipes the tears away. Why did I cry? she thought.

Y/N: uh I'm sorry, I got dust in my eyes... uh good afternoon, I'm sorry for being late... I'm Shiro's sister, L/N Y/N... nice to meet you Mr.

Rengoku: Rengoku...

Y/N's eyes widened, is it a coincidence she thought.

Rengoku: I'm Rengoku Kyoujiro, L/N Shiro's homeroom teacher... pleased to meet you too...

The three proceed and Rengoku hands Y/N Shiro's report card. Y/N looks at the report card and was pleased by it as she pats Shiro's head.

Y/N: you did great Shiro...

Rengoku: yes, L/N is good with study, and sports too... if his report card for his next term is as good as this, he could get a scholarship for college...

Y/N looks at the smiling Rengoku in front of her. It sent shivers down her spine, how his smile feels nostalgic to her.

Y/N and Shiro get up from the chair and thank Rengoku.

YN: thank you so much for your guidance and for taking care of Shiro at school...

Rengoku: no, I did nothing really... L/N is behaving nicely on his own... and he's diligent. Well, it's a pleasure to meet you... L/N Y/N san...

Rengoku holds his hand out and Y/N takes it as the two shake hands.

Y/N: I uh... it's a pleasure to meet you too... Rengoku sensei...

With that Shiro and Y/N left the classroom, leaving Rengoku alone, staring at the door.

Rengoku: I... found you...

■Rengoku's POV■

I watch as the two L/N left the room. That woman, it's her, I'm sure. I have memories of my past life. I was a demon slayer in my past life, and I'm part of the Hashira. 

I had a lover, her name is L/N Y/N. She's also a demon slayer, but not part of the Hashira. The woman that I love the most after my mother. I promised her that I'm going to be with her and would court her after returning from a mission. But, I didn't return from that mission for her, but she came for me instead.

That day, I died after being killed by a demon called Akaza. But I'm still grateful that I could see Y/N in my last moment, as she came with the backup team. The last thing that I see before my vision became blurry is, her smiling face, brimming with tears.

I walk to the window and watch as Shiro and Y/N walk out of the school ground. I see Y/N smiling sweetly at her brother. That sweet smile, it's the same. 

The image of her face when a tear rolls down her cheek earlier flashes through my head.

Rengoku: did she remember? do you... know me?

My heart clenches 

Rengoku: I... this time... I will fulfill my promise to you...

In this life...

I'm going to fulfill my promise to you..