Separated - Demon Slayer Fanfic

Kiyomi Akatsuki got raised by an old man who found her. But once the old man died, she was left abandoned again. Until she got found by a little boy in a deep forest that she had walked into. She learned her own breathing style and got taken away by the demon slayer corps, since they found her useful, but dangerous if she would walk on free foot.

After she got trained to a high ranked demon slayer who surpasses the strength of the 9 pillars with great fighting skill and power, she got bored of the head quarters and left to walk around and fight demons as the low ranked demon slayers. That's when she finds an interesting 3 manned team, joined by a demon. Coming shortly after is two other demons who'll join them all.