Lunagel

Heavenly Saint Lunagel (天空聖者ルナジェル, Tenkū Seija Runajeru) of the Serene Moonlight Element (冴える月影のエレメント, Saeru Tsukikage no Eremento) was the last person to see Blagel, who orders her to seal the Hades Gates with "key magic", ensuring it would stay closed as long as she lived. She has the key that will open the Inferno Gate. As she was about to depart for Magitopia, Lunagel is attacked by Raigel, losing her memory as a result and becoming a human.