Tuturu is the catchphrase of Mayuri Shiina, a main character in Steins;Gate, first released as a visual novel in 2009 and adapted into anime in 2011. She uses the cheerful sound as a greeting, and fans quickly adopted it as a shorthand for her gentle, optimistic personality. Clips of the phrase circulated on anime forums, video edits, and soundboards, where its cute, distinctive delivery made it instantly recognisable. It remains popular because it works as both a nostalgic reference for Steins;Gate fans and a lighthearted reaction for anyone who hears it.