This clip is identified by its embedded track information as Eri Sasaki's Gate of Steiner, and it circulates online as a short soundboard excerpt rather than a full song. Fans have picked up its drifting, heaven-like vocal line for anime edits, tribute videos and reflective montages, where a few seconds are enough to set a mood. Its popularity comes from that brevity and recognisability: it signals a wistful, dreamlike moment without needing dialogue or explanation, so it keeps appearing in new edits.