You and Muichiro were best friends since your childhood. You did everything together, but one day he just disappeared.

You were worried about him so much, but there wasn't any signs of him. You asked everyone who knows him if they've seen him. Nothing.

You've been eyes to eyes with a demon. It traumatized you. You became a Demon Slayer after some years and after a lot of hard trainings you became a Hashira.

That's when you noticed... your old friend, Muichiro. He seemed different like he was.. emotionless?

Of course he didn't noticed you. You were wearing a mask because of the scars on your face which prevented him from knowing it's you.

Now you two were on a mission, he wasn't saying anything and neither were you. Does be still remember? Will he know who you are if you two get closer? You were wondering.