Tutturu is the signature greeting of Mayuri Shiina, a central character in Steins;Gate, the science-fiction visual novel first released in Japan in 2009 and later adapted into a popular anime series in 2011. In the story she uses the made-up word as a cheerful hello, and fans quickly adopted it as shorthand for her kind, carefree personality. Clips of the line spread through anime communities, fan edits and short-form videos, where it became a recognisable audio cue for cute or nostalgic moments. Its short length and distinctive melody keep it easy to reuse in new edits years later.