A red-haired boy and member of the Demon Slayer Corps. He has an extraordinary sense of smell and was sent to infiltrate the Yoshiwara red-light district disguised as a woman along with Zenitsu and Inosuke to find Uzui Tengen's three missing wives. He has seen Kibutsuji Muzan before, which shocked everyone in the Corps. He carries a box containing his sister on his back. He is brave and refuses to leave the Entertainment District despite orders.
