Mia, also referred to as Mia Kakuta or Tsunoda Mia, is a student exorcist who attends the same school as the protagonist Kumi. When Kumi and her friends accidentally summon a malicious ghost through a witchboard, the spirit begins possessing the girls and forcing them to steal sexual energy from others. Frightened and no longer in control of her own actions, Kumi seeks Mia’s help. Mia agrees to assist, and in return Kumi begins working on the cases that Mia investigates. Mia is portrayed as someone others turn to when supernatural trouble arises, suggesting she possesses knowledge and competence in dealing with spirits. She takes on a second case involving a rapist with otherworldly powers, eventually discovering a man whose insatiable sexual appetite in life continues to drive him after death. Her primary motivation is to exorcise these entities and protect those affected. She develops a working partnership with Kumi, who acts as her assistant during investigations. Mia’s notable abilities include conducting exorcisms, identifying supernatural threats, and navigating cases that involve possession and malevolent spirits. Her background as a student exorcist places her at the center of the story’s conflict, though the narrative does not depict significant personal growth or change over the course of the series.