Mayuri Shiina's tuturu greeting comes from Steins;Gate, the science-fiction story first released as a visual novel in 2009 and adapted into an anime in 2011. In the series, the cheerful, good-natured Mayuri greets her friends with the invented word, and it quickly became her defining catchphrase. Fans clipped the short greeting for soundboards, anime edits and reaction videos, where its instantly recognisable sweetness made it a shorthand for cuteness. It remains popular because it needs no translation to convey a warm, playful hello.