Kagami Mira

Identity: A yokai's cloud mirror.

She is a yokai of the mirror installed in the toilet of the old school building, which is not used now.

Originally a mourning god with a hand mirror, the mirror's face would appear and startle those who saw it, but over time it took on the appearance of a human being.

However, she could only act "in the mirror" and could not go outside.
In order to go out, one must see the reflection of the other person in the mirror.