Flashback:
His family were friends with Yoriichi and they passed down his earrings and a dance called the Hinokami Kagura - the dance was actually Sun Breathing forms - but after a couple of hard missions then I'll tell him what I know. He's Yoriichi's successor, the successor of the man who almost killed Muzan before he fled, Tanjiro Kamado.
Y/N POV (Age 14):
The train conductor came down the hallway of the train, stamping people's tickets with a forlorn look on his face, seeming as though he's not here in mind but only in person. As if he was being controlled or manipulated by someone, something. A demon.
People had their tickets stamped however I handed over a fake I had made just in case something like this happened, and he stamped it before moving on without another word. After his footsteps faded away, everyone fell asleep on the train, including the others.
Looking out of the window, I honed my hearing and heard movement on top of the train while smelling a demon there too. By the smell and sound of it, it was a stronger demon, a Lowermoon. It wasn't strong enough to be a Uppermoon, yet I knew it would be a nuisance more than a threat.
Clambering out of the window, I jumped onto the roof of the train approaching the smell. The demon seemed to be having some sort of internal monologue and was having an evil laugh before it turned around after anticipating my approach. Lowermoon 1, was what its eyes read.
"So... Was my spell not effective on you? Interesting... Plus the way you tricked the conductor was impressive. You have your wits about you..."
"Well thank you, Lowermoon 1 for the compliments, however, he reeked of a demon, so I was able to determine that something was wrong on the train. However it seems I was too late, so I was unable to save the others; only myself."
"Yes, well, that was a pity... Don't worry, I'll put you out of your misery so you can join your comrades in their eternal sleep."
"Well, I thank you, but I should be able to save them if I defeat you, correct?"
"You should, but that's if you can kill me. My name's Enmu, nice to meet you...?"
"Y/N, Y/N L/N."
With that, I dashed at him, preparing myself for Galaxy Breathing's first form: Heliacal Rising.
——————
Editing: Complete.