In Black Witch Mirror, mirrors are not mere tools for reflection but dangerous portals. The story begins when a young girl living a quiet life encounters a mysterious witch. This witch does not simply see through mirrors; she actively manipulates the contents within them.

As the witch's influence spreads, the girl's town begins to experience unusual events, and reality becomes increasingly unstable. The boundary between memory and illusion grows dangerously thin, and every reflection starts to show fragments of hidden truths—forgotten pasts, repressed desires, and unsettling possibilities. The more the protagonist is drawn into this mirrored world, the greater the risk of her completely losing her sense of identity.

The series is created by Togawa Yonan. The narrative follows the young female protagonist as she confronts this supernatural threat that distorts perception and reality. The setting shifts from an ordinary, peaceful town into a disorienting environment where reflections cannot be trusted, and the antagonist witch remains a manipulative force operating from within the mirrors. The core conflict revolves around the protagonist's struggle to discern truth from illusion while battling an enemy that can alter what is seen in the glass.