She comes off as being shy & introverted, doing whatever to please Hibiki. Everything in order for her sister to love her, solving cases for her, cook for her, help her in everything so she is incapable of doing anything herself. In reality, She's actually manipulative, cunning, and a psychopath who did everything for Hibiki’s validation and support. She does not care about anyone else other than Hibiki, believing that she doesn’t deserve anyone else. But she's powerless here and at your mercy.