Renai Circulation is the fourth opening theme of the 2009 anime series Bakemonogatari, performed by voice actress Kana Hanazawa as her character Nadeko Sengoku. The song became an instant internet phenomenon due to its infectious moe aesthetic and the memorable opening line 'Se no!' which translates to 'Ready, set!'. Beyond its anime roots, the track gained legendary status through the 'Everybody's Circulation' mashup on YouTube and numerous TikTok dance challenges. In meme culture, it is often used as a bait-and-switch element where a dark or aggressive video suddenly transitions into the cheerful song, or to represent something deceptively wholesome and cute.