The clip comes from the Kamen Rider tokusatsu franchise, the long running Japanese series built around armored heroes, transformation devices and Henshin sequences. Fans clipped the Metzamero Booster cue from Zeztz related material and shared it on soundboards and short video edits, where its clear build and release made it easy to reuse outside the show. It stays popular because the boost is instantly readable even without visuals, so creators borrow that heroic transformation feeling for games, cosplay and anime style power ups.