Gyutaro was one of the primary antagonists in the Entertainment District Arc of Demon Slayer: Kimetsu no Yaiba. She was a demon affiliated with the Twelve Kizuki, holding the position of Upper Rank Six, a position she shared with her younger sister, Daki. Over a century ago, Gyutaro was a human who worked as a debt collector in the Rashomon Riverbank of Yoshiwara, the lowest class in the Entertainment District, before her and Daki were turned into demons personally by Doma.