Thouser is the Rider form of Gai Amatsu in Kamen Rider Zero-One, the 2019 Japanese tokusatsu series from Toei. Amatsu, head of ZAIA Enterprise, transforms with the Thousand Driver and the Amazing Caucasus Progrise Key, and his golden armour and five horns set him apart from the series other Riders. Shortened henshin audio like this one circulates widely among tokusatsu fans, who trim the full sequence for quick use in edits, memes and reaction videos. Its compact length and distinctive announcement keep it useful long after the series ended.