The phrase comes from Japanese fan slang, where shika katan combines shika, meaning only, with a slang form of win, to declare absolute loyalty to one person. Online, Naka-chan is treated as a beloved figure within a small fan circle, and the clip circulates as a fourteen second music meme rather than a full song release. Short looping chants like this spread easily on social video because the hook repeats quickly, works without context, and can be reused for any character fans want to crown as the only winner.