The Moon's Light, The Sun's Shadow Episode 9

As everyone in Sephiro Fiore becomes saddened and frightened by Ginka's disappearance, Luna is called by her butler to stay at her villa to rest. Whilst there, she recalls how her twin sister, Serena, disappeared one day, as well as remembering when she first awakened to her powers. As Luna contemplates her feelings for Akari, she is seemingly visited by her, making her feel a lot better. However, when Luna expresses her feelings to her, it is soon revealed that the Akari she has been speaking with is actually Cerebrum, who forces a Diabolis card into her body, transforming her into a hybrid of a Daemonia and an Elemental Tarot user.