Kyon no Imouto

She is the biological younger sister of the protagonist Kyon — a bright and bubbly elementary schooler who, despite her limited screen time, never fails to liven up any scene she appears in. Her cheerful, prank-loving nature brings a refreshing lightness to the story. Notably, she has developed a warm and endearing bond with Yuki Nagato, whom she affectionately calls by her first name. Whether in everyday family settings or during the Literature Club's group outings, she consistently serves as a beloved mood-lifter beyond the main cast.