Demon Slayer: Kimetsu no Yaiba Entertainment District Arc Episode 4 SUB at Gogoanime

Synopsis: Inosuke charges into Makio's room, which he finds empty, but detects the presence of a demon. Giving chase, he ends up losing the demon by a hair. Meanwhile, at Kyogoku House, Zenitsu tracks down the source of the young girl's sobs, where he encounters an Oiran, who he is sure is a demon. The demon who dwells in the Entertainment District as Warabihime Oiran is Upper Six, Daki. (Source: Funimation)