Yuuka is a quiet, obedient and innocent girl. She could only continue to apologize at the end, it was because of her dark childhood. She had never felt hate or love since she was kid, so she became a slightly mentally damaged girl. She thought she doesn't have a right to choose her own will, she is always restrained by the trauma she has experienced. She is very timid and shy, she doesn't want to show her expression nor say what she really wants