Chiikawa began as a manga series by Nagano and became a popular anime about tiny cute animals living through small everyday struggles. Usagi, the excitable rabbit friend of Chiikawa and Hachiware, is known for loud, nonsense vocal bursts instead of clear speech, including cries that fans transcribe as Ura, Yaha, and Wula. Short clips of those shouts travel easily on social media and soundboards because they need no translation. Fans reuse Usagi's Wula as a reaction for hyper, happy, or mischievous energy in edits, chats, and streams.