She is Aya's cousin. During Aya and Aki's 16th birthday, Miori's mother was there but was deeply damaged internally when Aya released her tennyo powers.Because of this, Miori blames Aya for killing her mother, which Aya doesn't know about. In order to seek revenge, she follows Kagami's orders to get rid of Aya by transforming herself into a tennyo.
