Author's Note: Edited

Demon Slayer x Reader
Y/n is a year older than Tanjiro and was taken in by the Kamados. She uses Moon Breathing and has for years. What happens when she attacks a Hishira?
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There will be two paths later on in the book. After the book splits which will happen around the Mugen train arc maybe after the yandere path will be marked with a 🔪 while a regular path will be marked with a 🌸