She is the sister-in-law of the main character, Touya, and a first-year student at the same academy. Unlike her extroverted brother-in-law, she has a very introverted personality, however, she is able to express her feelings honestly to her family, especially to Touya. Her parents were hesitant to let her out of their home because of her shyness, but allowed her to enter the school on the premise that she would live with Touya.
Her hobbies are appreciation of biographical works, such as movies and books, and playing video games.
