Ane no Migawari de Konyaku shitara Naze ka Henkyou no Seijo to Yobareru you ni narimashita summary:
Sylvia, the second daughter of the Count family, who carefully used her tired sister, Isabella's sacrifice. One day, Sylvia decides to marry a young Margrave Fernando instead of her sister who says she's tired of her fiancé !? She said she didn't like it, but Fernando is nice and the Margrave is green. There are many and it is very beautiful. It would be great if you could spend a relaxing time in such a place! Sylvia begins to be adored as a "Saint of the Frontiers" after saving the mountain lord with the rebirth magic that was fixing her sister's sacrifice. However, Isabella cried, "My sister robbed my fiancé," and an angry prince came over ...!?