Jimi Hime to Kuro Neko no, Emmanna Konyaku Haki

Seren the eldest daughter of a duke family has been compared to her sister Marietta who is said to be an exquisite beauty and has grown up being called the plain princess She overhears her fianc Prince Helios and his friends talking about how Marietta should be the princess consort instead of Seren
In order to make Prince Helios happy she want to break off the engagement without causing any trouble to anyone With the black cat familiar she borrowed from the Leader of the Ice Mages Viol she aims for an amicable engagement annulment