The phrase comes from Steins;Gate, the 2011 anime adaptation of the visual novel, where Mayuri Shiina uses Tuturu as her signature greeting. Fans quickly picked it up as shorthand for her cheerful, gentle personality, sharing it in anime edits, reaction videos and soundboards long after the series aired. Because the greeting is short, melodic and instantly tied to one beloved character, it still works as a friendly audio stamp for cute moments, cosplay clips and lighthearted memes, even for viewers who have only seen the catchphrase online.