Yutaka Kobayakawa

Yutaka Kobayakawa is Konata's cousin and Yui's younger sister, a cheerful but sometimes forgetful first-year student at Ryōō Gakuen High School. Because she is physically weak and prone to illness, she moves in with Konata's family rather than make the long commute from home. Her small stature and development are a recurring source of concern for her.