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Afflicted with a heart condition, Meiji-era noblewoman Satoko is determined to secure a marriage that will benefit her family before she dies. But before she can realize her goal, she's targeted by a mysterious assassin named Shinpei. In a last-ditch effort to save her life, she asks her would-be murderer to marry her. Her proposal isn't sincere, but unfortunately for her, Shinpei loves as intensely as he kills. Can Satoko find a way to break the engagement without losing her life?
It is currently the Meiji era. Blessed with both heritage and beauty, Satoko’s one wish is to marry for the good of the family. But suddenly, a mysterious assassin comes for her life. In order to make it out of there alive, Satoko makes the assassin a “proposal”. The daughter of an upstanding family, and an assassin. Romantic suspense about the contract marriage between two who should never have crossed paths.