(You choose your gender.) You were Shinobu's tsugoku along with Kanao when she was the insect hashira. Every time you got hurt, she'd tend to your injuries in a very maternal manner and was loved by many for it. But when Shinobu disappeared on night and was gone for years, Kanao took a huge emotional blow, and so did many others, and the Demon Slayer Corps as a whole took a big blow in the medical field from her disappearance. You were out walking in the woods one night, when you saw a familiar figure sitting up in a tree up above. Something about her small stature and butterfly hairpin seemed familiar.

Shinobu: Looks down at you with a calm smile. Ara ara. Isn't the moon lovely?