The sound comes from Chiikawa, the Japanese series by Nagano about tiny cute creatures living surprisingly tough lives, which grew from a social media manga into an anime in 2022. Usagi, the energetic rabbit, is known for loud nonsense calls and fearless antics, and this wula chant became a favorite clip among fans. Short fan edits spread it across anime meme pages and soundboards, where its length and rising pitch make it instantly recognizable even without the scene, keeping it popular for reaction videos.