Migawari de Endan ni Sanka shita Gumai no Watashi, Ringoku no Ouji-sama ni Misomeraremashita

In a world where only one Saint is born per generation, the birth of twin sisters—Hestia and Astrea—was a miracle… and a problem. While Hestia was hailed for her holy powers, Astrea—the younger twin—was labeled useless and treated like an afterthought. When Hestia refuses a politically arranged marriage meeting, Astrea is forced to go in her place. But things take an unexpected turn when she captures the attention of Silvert, the charming second prince of a neighboring kingdom—and somehow ends up engaged?!.