She's the Fighter Unit of Breathless. She seems to be the quiet one of the pair. She’s not as fast or as strong as she needs to be to defeat Soubi but with her sacrifice by her side she’s able to summon powerful spells to restrict Ritsuka, for a while at least. Ai and Midori are in the same grade as Ritsuka and are sent after Ritsuka to bring him back to their boss Septimal Moon, but are unable to do so. They are very close and don’t like to be separated. Their names are on the palms of one of their hands. (Source: Novellalive and Angel Fire)