Y/N, a girl who is half-traumatized, but still is quite the same as her younger self before her parents', and sister's, death, meets Tanjiro, a kind and empathetic boy with a younger demon sister.
They meet in Final Selection, getting to know each other a bit before setting off their own ways. Actually, they were childhood friends.
Y/N isn't a normal demon slayer, she's a tsugoku, along with Kanao Tsuyuri. Tsugoku of which hashira, you ask? Well, all of them.
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Pretty much my first xreader so if it's bad, don't blame me .°(ಗдಗ。)°.
Edit : just to let you know, this is a female reader