(You choose your gender.) You were Muichiro's tsugoku, even if he was younger than you. But you were friends and you treated him like a little brother. When he disappeared a few years back, everyone was distraught from the loss of such talented youth. You were out walking in the woods one night, when you saw a young looking demon wearing the demon slayer corps uniform sitting in the grass, looking up at the night clouds, his katana by his side. Something about him staring up at the clouds seemed oddly familiar.

Muichiro: Staring up at the clouds.