Katon no Jutsu comes from Naruto, the long-running manga and anime series where shinobi use nature-based techniques, and Katon is the Japanese term for fire release. Fireball and other fire-style attacks became signature moments for characters such as Kakashi Hatake, whose copied techniques and Mangekyo Sharingan made him a fan favourite. As Naruto clips circulated on video platforms and soundboards, short technique calls like this one were lifted for edits, reaction videos and memes, where the recognisable shout alone signals a fiery attack. Its continued use comes from that instant recognition among anime fans.