As the daughter of a count, Sarah is unable to socialize and is ostracized by aristocratic society because she has a condition which prevents her from recognizing faces. She is despised by her family and marries the infamous "Duke of Evil" as a substitute for her sister. Calyx is feared as an unfair husband, but he is actually the complete opposite of that! She received a gift of a custom-made dress and a first date holding her hand with a kind word that made her bewildered. For the first time in her life, he treated her like a princess, and the burn mark on her face, which everyone abhors, became the only mark that could distinguish her from others and endear her to him. This is a sweet Cinderella story of an unfortunate young lady who finds her place in the world, doted upon by the "evil duke!" 顔を見分けられない病を持つ伯爵令嬢サラは、社交の場での失敗をきっかけに、家族からぞんざいな扱いを受ける日々を過ごしていた。 そんなある日、妹の身代わりに、醜い火傷痕を持ち『悪人公爵』と恐れられるカリクスとの結婚を命じられる。 しかし、嫁ぎ先でサラが出会った彼は噂と全く違っていた！？ 「君には笑っていてほしい」 カリクスの優しさに触れ、徐々に自信を取り戻していくサラだったが、かつて社交界で最大の失態を犯した相手に再会してしまい――？