Kusanagi no Tsurugi is a legendary sword from Japanese mythology and one of the Imperial Regalia of Japan, said to have been taken from the tail of the serpent Yamata no Orochi. The name has been reused widely in anime, manga, and games, most famously in Naruto where Orochimaru wields a Kusanagi blade and Sasuke later carries a sword of the same name. Online, the phrase became a reusable anime sound for edits because it combines familiar folklore with an instantly recognizable weapon reveal.