The title comes from the Japanese phrase meaning running in the rain, which describes the mood the clip is tagged with online rather than a confirmed film or anime source. Its exact origin is not documented, so it circulates mainly as a short background music clip on soundboards and in fan edits. Users share the 11 second loop for its rainy, reflective tone, reusing it across study playlists, edits and short videos where a brief emotional cue is needed without lyrics or a full song.