The line comes from Steins Gate, the 2011 anime adaptation of the visual novel, where Mayuri Shiina, the gentle childhood friend of Rintaro Okabe, greets people with Tuturu. The catchphrase became her defining trait and spread through anime forums, fan edits and soundboards as a shorthand for her character. A shorter Tuturu clip also circulates on its own, but this version keeps the full self-introduction. Its lasting popularity comes from how distinct and kind it sounds, making it easy to recognize and reuse.