Tuturu is the signature greeting of Mayuri Shiina, one of the main characters in Steins;Gate, a science-fiction series that began as a visual novel in 2009 before becoming a popular anime in 2011. Mayuri uses the playful phrase when greeting friends, and fans quickly adopted it as shorthand for her cheerful, caring personality. Clips of the greeting spread through anime soundboards, reaction videos, and short-form edits, where its short length and instantly recognisable tone made it easy to reuse. It remains popular because it instantly signals warmth and nostalgia for viewers who know the series.