Sword Art Online began as a light novel series by Reki Kawahara before its 2012 anime adaptation, set inside a virtual reality game where players navigate menus with hand gestures. The menu open chime became one of the series' most recognisable interface sounds, alongside its login and notification effects. Clips and recreations spread through anime forums, YouTube edits and soundboards, and fans began using the effect outside the show to imitate opening an in-game HUD. It remains popular because it instantly identifies the reference for viewers who know the series.