Renai Circulation began as an opening theme for the anime Bakemonogatari, performed in character by Kana Hanazawa as Nadeko Sengoku, and its bright melody and playful lyrics quickly made it a fan favourite. The song spread far beyond the series through dance covers, karaoke, remixes and countless fan-sung versions shared on video platforms, where its catchy hook became shorthand for cute, flirty anime energy. Years later it still appears in edits and memes because the tune is instantly recognisable, even to viewers who have never watched the show.