Websadly, in the infinity castle arc, muzan kibutsuji kills mitsuri in battle. After the battle, iguro is shown with mitsuri’s body, and they are aware that her time is near. Webin the vibrant world of “demon slayer:

Webthe reason for mitsuri becoming a hashira can be found in her name, love. she took the nichirin blade in her hand in order to find a suitable marriage partner in the. Webmitsuri’s face suddenly darkens when she is told that the shinazugawa brothers are not on good terms. She thinks it is scary of sanemi shinazugawa to deny his little brother. Webthe reason mitsuri is likely so fond of her is due to her own experience with being different and being outcast by those who don't understand her. Webkilling demons marks emerges as two hearts with winged figures underneath each heart; Mitsuri’s mark appears to be on the left side of her throat.

Webkilling demons marks emerges as two hearts with winged figures underneath each heart; Mitsuri’s mark appears to be on the left side of her throat.