[Demon Slayer] Moon Flower

I have a younger brother, a younger brother who has never called me "sister". But I don't care. What made me a little concerned was that suddenly one day, my younger brother with whom I didn't have a good relationship changed. The voice, appearance... Everything is exactly the same, but the feeling he gives me is definitely not the original one. He is definitely not my brother. This is a fake. And no one found out about this except me. —— The heroine has a cold temperament. Although she discovered that her brother was being raped, she didn't care. It can be seen as a women's version of a low-profile grinding head (not —— First person, please proceed with caution. Short and medium stories. Purpose: Persist in a better life and move towards a happy tomorrow