The melody comes from Naruto, the Japanese anime series that began in 2002 adapting Masashi Kishimoto's manga. Its flute themes became deeply linked to the show's emotional flashbacks and to Naruto Uzumaki's lonely childhood, so fans recognise the sound in seconds. Short loud clips labelled tururu spread through meme pages, messaging apps and soundboards, where the name imitates the flute notes themselves. It remains popular because the tune instantly signals mock sadness and nostalgia to anyone who grew up watching anime online.