Guardian Angel for Cursed Duke

Astria leads a peaceful life as the keeper of the eternal haven. Until one day, a man on the brink of death shows up. The man turns out to be Duke Earhart, the most handsome and youngest swordmaster in the empire. Astria manages to save the dying duke with her magic, but the healing magic is only maintained in close proximity... After listening to Earhart's pleas, she decides to follow him into the human world. With her accidental introduction as a duchess, Astria slowly adjusts to her new life. Will Astria be able to find true love and break the curse?! (Source: NHN comico Corp.)