After pooring her blood, sweat and tears into saving her family's estate, Crysta is betrayed by her stepsister, stepmother and fiancé, who cheat her out of her inheritance and sell her off to marry the mysterious Masked Earl, Lord Gerald of Berverk. He is said to be cold and antisocial, an emotionless man who only seeks a wife to give him an heir. Defeated, broken-hearted and all alone in the world, Crysta makes the long journey to his estate, fearing for the worst... 「はっきり言おう。俺に必要なのは妻ではない。跡継ぎだ」継母の企みで、人嫌いで有名な辺境伯ジェラルドに嫁いだクリスタ。常に仮面をつけている彼は仮面伯爵と呼ばれていて、素顔だけでなく心をも閉ざしていた。跡継ぎを産むだけの契約結婚に戸惑いながらも、やがてクリスタは伯爵の不器用な優しさに惹かれていく。一方でジェラルドも彼女に恋心を抱くが、仮面の下の秘密が邪魔をして……。「君は俺を、おかしくする――」