姉のことが好きな筆頭魔術師様に身代わりで嫁いだら、なぜか私が溺愛されました！？～無能令嬢は国一番の結界魔術師に開花する～

Thetis, the daughter of an earl, has always been compared to her talented sister and treated as incompetent by her family.One day, Thetis receives a marriage proposal from Noah Savoid, the country's best magician.Her sister cruelly tells her, "Noah loves me, but I have a fiancé, so it can't be. You should comfort him as best you can."However, once she marries into the Savoid family, what awaits her is Noah's overwhelming doting love...!?