Grace, a poor countess, is desired by Ansel, the duke of the moment. "It's love at first sight," and in three days they are to be happily married... but she overhears Ansel saying, "It would be terrible if we were to get married." Apparently, she was a decoy to catch a nasty man who wanted the duke's house. Grace is shocked, but she tries to do her part as a decoy to lure the culprit out to the end, but...? The high-spec duke and the headstrong countess are interwoven in this romantic comedy of super-crossed paths! 貧乏伯爵令嬢のグレイスは、今をときめく公爵アンセルに「一目惚れなんです」と望まれ三日後には幸せな結婚をする……はずだったのに、「このまま結婚することになったら最悪だ」というアンセルの言葉を立ち聞きしてしまう。どうやら彼女は公爵家を狙う厄介な男を捕らえるための囮だったらしい。グレイスはショックを受けながらも、せめて最後まで囮としての役目をまっとうしようと犯人を誘き出す作戦を立てるが――!? ハイスペ公爵様と諸突猛進伯爵令嬢が織りなす超すれ違いラブコメディ！