Emmeline is the only direct descendant of Margrave Garrett's family who protects the boundary between the monster and human worlds with her powerful magic. But for some reason, she didn't have any magical powers. For this reason, she marries Damian, who has strong magical powers, and her role is to have a child with him, but Damian is a man who often threatens to break off her engagement and degrades Emmeline. Her only emotional support is Emmeline's personal escort knight Bart and her maid Alma. Bart secretly feels for Emmeline, who continues to endure Emmeline's unreasonable treatment out of a sense of responsibility. Even if their feelings were mutual, the two would never be able to be together...!? The engagement is about to be called off x A love fantasy based on the difference in social status!