Emmeline is the only direct descendant of the Garrett Marquisate, which protects the boundary between the human world and the realm of monsters with its powerful magic.
However, for some reason, she was born without any magical power.
Because of this, her duty is to marry Damian, a man with strong magic, and bear his child.
But Damian is the kind of man who repeatedly threatens to break off their engagement and humiliates Emmeline.

Her only sources of comfort are her personal knight, Bart, and her maid, Alma.
Bart secretly harbors feelings for Emmeline, who continues to endure unreasonable treatment out of a sense of duty.
Yet, even if their feelings were to reach each other, they are bound by a fate that would never allow them to be together—!?