Tuturu is the signature greeting of Mayuri Shiina, a central character in Steins;Gate, the science-fiction visual novel first released in 2009 and later adapted into a popular anime series in 2011. Mayuri says the playful phrase as a cheerful hello, and fans quickly adopted it as shorthand for her warm, carefree personality. As Steins;Gate clips circulated on video platforms and soundboards, the greeting became a recognisable anime reaction sound, used far beyond the original story to greet viewers, lighten edits and signal a cute or innocent moment.