The sound comes from Kamen Rider Faiz, a Japanese tokusatsu series in the long-running Kamen Rider franchise, where the hero uses the Faiz system to transform and access faster, more powerful forms. The Accel cue is tied to that sense of sudden speed, and it has been shared widely by fans who reuse transformation audio in edits, reaction clips and tribute videos. Because the electronic charge is instantly recognisable to tokusatsu viewers and still reads as a generic power-up cue to others, it remains a popular choice for short-form creators.