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In a world where the art of assassination has been perfected over centuries, the Gero family reigns supreme among the Poison Masters. Hikaru Gero, the heir to this powerful bloodline, has spent his life shrouded in secrecy, far removed from the concept of love or marriage. However, with the survival of the Poison Master lineage hanging in the balance, Hikaru's sister is forced into an arranged marriage to secure the family's future.

As Hikaru navigates this treacherous landscape, he finds himself face-to-face with Mei Kinosaki, a cunning marriage swindler who has become his latest target. But instead of eliminating her, Hikaru makes a shocking proposal: he asks Mei to help him find a suitable wife. As the unlikely duo embarks on a perilous quest for love, they must navigate the complex web of alliances and rivalries between the Poison Masters, all while keeping their true intentions hidden from prying eyes.

Together, the assassin Hikaru and the marriage swindler Mei embark on a high-stakes mission to find the perfect partner, all while avoiding the cutthroat world of Poison Masters and their deadly rivalries. Can this unlikely pair overcome their differences and achieve their goal of a successful marriage, or will their respective skills and secrets tear them apart?