Gawr Gura debuted in September 2020 as part of Hololive English's first generation and quickly became one of the most subscribed VTubers in the world, a shark girl known for her 'a' greeting, deadpan humor and gaming streams. Fellow first-generation member Mori Calliope, the self-styled grim reaper rapper, has collaborated with her many times, and clips of the two together circulate widely among fans. This sound is a user-uploaded, roughly one-second snippet in that fan tradition, shared as a quick reaction sound rather than an official release, and it keeps spreading through edits and soundboards.