[Serialized Manga] When I Became Engaged to a Cursed Prince as a Substitute for My Sister

Cecilia, a marquis's daughter, witnesses her fiancé Leonardo embracing her biological younger sister Erika. "Big sister, I'm truly sorry... I've fallen in love with Leonardo. We are bound by true love." Erika says with a smile. "That's why, big sister. Please take on the political marriage with the ugly third prince in my place. It doesn't matter to anyone which sister it is, after all." "Yes, I understand." The marriage proposal that had come to Erika from the royal family was with the third prince Darius, rumored to be ugly due to a curse. ――Cecilia accepts everything and faces the betrothal ceremony. Having resolved to love Darius no matter what he looks like. (Could my standards of beauty and ugliness be that skewed...?) On the day of the betrothal ceremony, there stood a beautiful prince that defied all expectations.