My Sister Took My Fiancé and Now I'm Being Courted by a Beastly Prince (Manga) Vol. 1

A shojo/josei fantasy romance about a scorned noblewoman and a lion of a prince!

Cordelia, daughter of a countess, can’t seem to get married—mostly because her little sister Priscilla keeps stealing the hearts of her suitors. Ready to resign herself to a spinster fate, Cordelia is surprised when a handsome man suddenly courts her—and he’s a prince, no less! Prince Leonhardt, who possesses the power of a legendary lion, is a widely admired man but has his own quirks, such as pursuing Cordelia...