Mei Sagara is a central character from the anime series 'Kono Naka ni Hitori, Imouto ga Iru!'. She is a bright, intelligent, and somewhat mysterious girl who plays a significant role in the storyline. Mei is known for her calm demeanor and mature personality, often offering valuable insights to the main protagonist. As a classmate and potential romantic interest, Mei's interactions add depth to the narrative. Her background and intentions are gradually revealed, making her an intriguing figure in the protagonist's quest to identify his hidden sister among his admirers.