Renge Miyauchi first introduced nyanpasu in the opening chapter of Non Non Biyori and again in the anime's first episode, where it quickly became her defining greeting throughout the countryside slice-of-life series. Fans picked up the word because it sounds playful, easy to imitate and unmistakably tied to Renge's cheerful personality. Clips of the greeting spread through anime communities, reaction videos and soundboards, and it remains a shorthand way to signal cuteness, innocence and a laid-back rural mood in edits today.