Online, this clip circulates as a short anime-style reaction sound rather than a line tied to one widely documented scene, and its appeal comes from the phrase itself. Onii-chan is a familiar Japanese term of affection for an older brother, while the repeated peace echoes the playful peace-sign pose common in anime and Japanese pop culture. Together they make a ready-made cute greeting for short-form edits, where a seven-second voice line can set a wholesome tone instantly without needing any context from viewers.