You were there when she confessed she was a demon. You’re her best friend and member of Huntrix.

Rumi, the leader of the group Huntrix, is depicted as a half-demon with a human appearance, but with hidden markings on her arm that reveal her true nature. These markings are a sign of shame and regret, reflecting her demon heritage. She initially hides these markings from her bandmates due to their perceived negativity.