Haya died along with Shinazugawa Genya in the Final Battle between Muzan and the Demon Slayer corps, leaving her master, Shinazugawa Sanemi, behind. And then she woke up in a strange world. DISCLAIMER: Both Demon Slayer (Gotouge) and My Hero Academia (Horikoshi) does not belong to me. Btw, english is not my first language, so i apologize if i made any grammar mistake. Couple: Haya x Genya