Yui Narumi is a supporting character in the anime and manga series Lucky☆Star. She is Konata Izumi's cousin and serves as a police officer. Yui is known for her carefree, clumsy, and easygoing personality, which often provides comic relief. Despite her job, she tends to act more like an older sister than an authority figure. Her relationship with the main characters, especially Konata, adds warmth and humor to the series, and she frequently visits the Izumi household.