This clip is associated with Uruha Rushia, a Japanese VTuber whose emotional voice moments spread widely in fan edits and meme compilations. “Nande” simply means “why,” but her delivery made the line memorable far beyond its original stream context. The sound became popular in anime and reaction communities, where creators use it as a quick cue for confusion, betrayal or dramatic frustration. It remains common because the emotion is immediate, easy to understand and flexible enough to fit both sincere reaction edits and exaggerated joke posts.