The upload is credited simply to K9Kuro, with no documented original anime, episode or recording attached to the clip, so its exact source remains unverified. Short 'oniichan' voice lines like this circulate widely on soundboards and meme communities, where uploaders tag them by uploader name rather than by show. The word itself is a staple of anime fandom, and bite-sized readings of it get reused as reaction audio in edits, streams and short-form videos. This version has found a small audience the same way, passed around as a quick, recognizable fandom in-joke.