Once upon a time, there was a beautiful angel who lived in heaven. Her job was to protect the people of Alteria from wrongders. But one day she was banished for protecting a child - who had murdered his abusive parents... But the Coucil of Heavens did not agree whith her. They broke her wings. Her unstable emotions caused her to transform into a demon. This angel is now known to all as Oumiya Emma: the final dungeon boss that haunts Alteria's peace, still targeted by adventurers to this day.