Oro became famous as Himura Kenshin's catchphrase in Nobuhiro Watsuki's Rurouni Kenshin, which began as a manga in 1994 and was adapted into a TV anime in 1996. Kenshin says it constantly in his peaceful, everyday persona, contrasting with his past as the feared Battosai. Fans clipped the exclamation early in anime soundboard and AMV culture, and it survived as a shorthand reaction long after the series ended. Its brevity and instantly recognizable delivery keep it in rotation for confusion gags online.