My happy marriage (Manga)

"Considered nigh worthless for having failed to inherit the superhuman powers of the bloodlines into which she was born, Miyo Saimori lives her days unwanted and unloved. Her stepmother and her very own father have little time or affection for her, and Miyo must suffer being treated as a servant by her half sister who, unlike Miyo, is blessed with the unusual powers of their blood. Ultimately seen as nothing more than a nuisance and a drain on the...