One day, Elizabeth Magnus, the daughter of a lowly countryside noble family that recently got into some financial trouble, is suddenly kidnapped in broad daylight by a handsome yet incredibly irritating man she has never seen before. The man turns out to be duke Sylvestor, whose party-crazy sister has run off and is nowhere to be found, is convinced that the woman he found is his little sister, who coincedentally is also named Elizabeth and looks almost identical.
Upon realizing his mistake, Sylvestor makes Elizabeth an offer she can’t refuse: she will pose as his missing sister for half a year - or until he is able to find her - and he will provide financial support for her family. So starts Elizabeth Magnus’ life posing as Elizabeth O’Brien, the daughter of a noble.
『エリザベス！』名を呼ばれ振り返ると、見目麗しい貴族の男性が目の前に――。
突然腕を掴まれ、そのまま連れ去られてしまった田舎貴族のエリザベス。
『人さらいのお方』こと公爵家嫡男シルヴェスターに話を聞けば、駆け落ちして行方不明の妹・公爵令嬢エリザベスと瓜二つ、名前まで同じで…!?
困窮する実家の援助と引き換えに、転んでもタダでは起きない苛烈な令嬢エリザベスの、華麗なる身代わり生活はじまりはじまり――!?