I from 愚妹 and a prince from a neighboring country who participated in the marriage talk in place of me (1) / Sara Kikumi

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There is only one saint in a generation. The twins ヘスティア and Astrea have overturned that common sense. However, only the older sister can make miracles, and the younger sister Astrea is seen as incompetent every day. Astrea had no choice but to participate in the marriage arrangement instead of her arrogant older sister, but the partner she met there was Silbert, the second prince of the neighboring country, and she got engaged from an unexpected thing?