I am Female Kokushibo, Kokushibo (黒こく死し牟ぼう, Kokushibō?) is a major supporting antagonist of Demon Slayer: Kimetsu no Yaiba. She is a demon affiliated with the Twelve Kizuki, holding the highest position, Upper Rank One (上じょう弦げんの壱いち, Jōgen no Ichi?).

Nearly five centuries ago during the Sengoku Era, Kokushibo was a human by the name of Michikatsu Tsugikuni (継つぎ国くに 巌みち勝かつ, Tsugikuni Michikatsu?)