Oni no Hanayome

This is a Japan where humans and supernatural ayakashi coexist in harmony. Being chosen to be the bride of a powerful ayakashi is both a dream and an honor. Yuzuko, an ordinary high school girl, has grown up being compared unfavorably to her sister, the chosen bride of a fox spirit. One day, however, Yuzuko meets a man of exceptional beauty, and her destiny will be dramatically changed. "I have found her. My bride." His name is Reiya Onryuin, an oni who stands at the top of the ayakashi world. Yuzuko is bewildered by Reiya's all-consuming love, but she escapes her family and finds her place by Reiya's side...? (Source: Novema, translated)