The tune comes from Amane Suou, one of the main heroines of The Fruit of Grisaia, a visual novel series later adapted into anime. In the series she sings a simple, improvised song to keep her pace while running, and fans clipped the moment for its charm. It spread through anime soundboards and short-form edits, where its short fourteen-second loop made it easy to reuse. It remains popular because it is instantly recognizable to Grisaia fans and adds a light, nostalgic touch to running jokes and wholesome memes.