You were a normal woman. 24 years old, good life, you were in collage. You had taken Japanese lessons from each high school year until you died? You weren't exactly dead, just, appeared it, as you were sent to the world of Demon Slayer, during the Tokugawa era (1817). And since you aren't from that era, you have greater smelling blood (it smells better) and regeneration. Clones names are Sekido, Karaku, Urogi, Aizetsu, and Zohakuten. They are upper moon 4.