This sound is tied to Demon Slayer: Kimetsu no Yaiba, where Nezuko Kamado is one of the series' most recognizable characters. Online, the phrase “Nezuko-chan” spread through anime clips, reposts and meme edits because the delivery is instantly recognizable and easy to use as a reaction. It remains popular in fandom content, short-form videos and joking “best girl” edits, much like other recognizable anime catchphrase sounds such as Onii-chan, onii-chan.