https://
cf.r.kamihimeproject.dmmgames.com/front/images/background/61/chara_r_61.png

Not Diana, the Girl Above her that looks like a Eidolon with Heterocrhomia and a Sadistic look. Srsly, who is she? She is not part of the event, she is not in the gacha, she is not part of a promotion. She is part of a future update? or cut content maybe? Idk, she really got me curios.