Shinobu Kocho is the Insect Hashira in Demon Slayer: Kimetsu no Yaiba, the manga series that began in 2016 and reached a wider audience with the 2019 anime adaptation. Her polite, teasing way of speaking made short voice clips easy to lift for edits. Moshi moshi is the standard Japanese greeting for answering the phone, so the line works outside its original scene. Fans shared the clip across anime soundboards, TikTok edits and reaction posts, where it became shorthand for a cute, slightly smug hello.