Yutaka is Konata's cousin and Yui's younger sister. She first appeared in episode fourteen in the anime when she was admitted into Ryōō High School and moves to live with Konata to help with the commute. She has been known to be quite sickly which has impacted her school life, but she remains cheerful nonetheless. She befriends Minami Iwasaki, Hiyori Tamura and Patricia Martin at school.
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