Mayuri Shiina's Tuturu greeting comes from Steins;Gate, the science-fiction visual novel first released in 2009 and adapted into a popular anime in 2011. In the series, Mayuri uses the cheerful phrase as her own playful hello, and fans quickly adopted it as one of anime's most recognisable cute catchphrases. Clips of the Tuturu sound spread through anime edits, reaction videos and soundboards, where it became shorthand for sweetness, innocence and light-hearted humour. It remains popular because it is short, instantly familiar and tied to a beloved character.